GLM 5.1

z-ai/glm-5.1-20260406

Z.ai: GLM 5.1 is a text‑only model from the provider z‑ai that supports reasoning and tool integration, with open weights available. It provides a context length of 202 752 tokens and is priced at $0.966 per million input tokens and $3.036 per million output tokens. The model was released on 2025‑01‑20.

  • tool use
  • structured outputs
  • reasoning

At a glance

providerz-ai
releasedMar 27, 2026
context205K
input / M$0.97

Specifications

What the API gives you

Context window
205K tokens
Max output
128K tokens
Input price
$0.97 / 1M tokens
Output price
$3.04 / 1M tokens
Cache read
$0.18 / 1M tokens
Modalities
text → text
Knowledge cutoff
Released
Mar 27, 2026

Measured evidence

Public benchmark record

Design Arena Coding
1308 Elo2026-07-28
Design Arena Coding
1308 Elo2026-07-27
Design Arena Coding
1308 Elo2026-07-30
Design Arena Coding
1308 Elo2026-07-29
Design Arena Coding
1307 Elo2026-07-31
Design Arena Coding
1306 Elo2026-08-02
Design Arena Coding
1303 Elo2026-08-05
Design Arena Coding
1306 Elo2026-08-01
Design Arena Coding
1301 Elo2026-08-09
Design Arena Coding
1305 Elo2026-08-03
Design Arena Coding
1303 Elo2026-08-04
Design Arena Coding
1298 Elo2026-08-14
Design Arena Coding
1303 Elo2026-08-06
Design Arena Coding
1302 Elo2026-08-10
Design Arena Coding
1303 Elo2026-08-07
Design Arena Coding
1288 Elo2026-08-18
Design Arena Coding
1302 Elo2026-08-08
Design Arena Coding
1291 Elo2026-08-15
Design Arena Coding
1302 Elo2026-08-11
Design Arena Coding
1300 Elo2026-08-12
Design Arena Coding
1294 Elo2026-08-21
Design Arena Coding
1298 Elo2026-08-13
Design Arena Coding
1287 Elo2026-08-19
Design Arena Coding
1293 Elo2026-08-27
Design Arena Coding
1287 Elo2026-08-20
Design Arena Coding
1291 Elo2026-08-16
Design Arena Coding
1290 Elo2026-08-17
Design Arena Coding
1294 Elo2026-08-22
Design Arena Coding
1294 Elo2026-08-23
Design Arena Coding
1293 Elo2026-08-28
Design Arena Coding
1294 Elo2026-08-24
Design Arena Coding
1294 Elo2026-08-25
Design Arena Coding
1294 Elo2026-08-26
Design Arena Coding
1292 Elo2026-08-29
Design Arena Coding
1292 Elo2026-08-30
Design Arena Coding
1292 Elo2026-08-31
Design Arena Coding
1292 Elo2026-09-01
Design Arena Coding
1291 Elo2026-09-02
Design Arena Coding
1288 Elo2026-09-03
Design Arena Coding
1287 Elo2026-09-04
Design Arena UI
1292 Elo2026-07-28
Design Arena UI
1292 Elo2026-07-27
Design Arena UI
1292 Elo2026-07-30
Design Arena UI
1292 Elo2026-07-29
Design Arena UI
1292 Elo2026-07-31
Design Arena UI
1292 Elo2026-08-02
Design Arena UI
1292 Elo2026-08-01
Design Arena UI
1292 Elo2026-08-05
Design Arena UI
1292 Elo2026-08-09
Design Arena UI
1292 Elo2026-08-03
Design Arena UI
1292 Elo2026-08-04
Design Arena UI
1292 Elo2026-08-14
Design Arena UI
1292 Elo2026-08-06
Design Arena UI
1292 Elo2026-08-07
Design Arena UI
1292 Elo2026-08-10
Design Arena UI
1292 Elo2026-08-08
Design Arena UI
1292 Elo2026-08-18
Design Arena UI
1292 Elo2026-08-11
Design Arena UI
1292 Elo2026-08-15
Design Arena UI
1292 Elo2026-08-12
Design Arena UI
1292 Elo2026-08-13
Design Arena UI
1292 Elo2026-08-19
Design Arena UI
1292 Elo2026-08-27
Design Arena UI
1292 Elo2026-08-16
Design Arena UI
1292 Elo2026-08-20
Design Arena UI
1292 Elo2026-08-17
Design Arena UI
1292 Elo2026-08-21
Design Arena UI
1292 Elo2026-08-22
Design Arena UI
1292 Elo2026-08-23
Design Arena UI
1292 Elo2026-08-28
Design Arena UI
1292 Elo2026-08-24
Design Arena UI
1292 Elo2026-08-25
Design Arena UI
1292 Elo2026-08-26
Design Arena UI
1292 Elo2026-08-29
Design Arena UI
1292 Elo2026-08-30
Design Arena UI
1292 Elo2026-08-31
Design Arena UI
1292 Elo2026-09-01
Design Arena UI
1292 Elo2026-09-02
Design Arena UI
1292 Elo2026-09-03
Design Arena UI
1290 Elo2026-09-04
Design Arena Web-app Agent
1225 Elo2026-07-28
Design Arena Web-app Agent
1225 Elo2026-07-27
Design Arena Web-app Agent
1224 Elo2026-07-30
Design Arena Web-app Agent
1224 Elo2026-07-29
Design Arena Web-app Agent
1224 Elo2026-07-31
Design Arena Web-app Agent
1226 Elo2026-08-02
Design Arena Web-app Agent
1225 Elo2026-08-01
Design Arena Web-app Agent
1225 Elo2026-08-05
Design Arena Web-app Agent
1221 Elo2026-08-09
Design Arena Web-app Agent
1226 Elo2026-08-03
Design Arena Web-app Agent
1226 Elo2026-08-04
Design Arena Web-app Agent
1215 Elo2026-08-14
Design Arena Web-app Agent
1225 Elo2026-08-06
Design Arena Web-app Agent
1218 Elo2026-08-10
Design Arena Web-app Agent
1226 Elo2026-08-07
Design Arena Web-app Agent
1214 Elo2026-08-18
Design Arena Web-app Agent
1226 Elo2026-08-08
Design Arena Web-app Agent
1218 Elo2026-08-11
Design Arena Web-app Agent
1216 Elo2026-08-15
Design Arena Web-app Agent
1219 Elo2026-08-12
Design Arena Web-app Agent
1216 Elo2026-08-13
Design Arena Web-app Agent
1213 Elo2026-08-19
Design Arena Web-app Agent
1207 Elo2026-08-27
Design Arena Web-app Agent
1213 Elo2026-08-20
Design Arena Web-app Agent
1217 Elo2026-08-16
Design Arena Web-app Agent
1217 Elo2026-08-17
Design Arena Web-app Agent
1213 Elo2026-08-21
Design Arena Web-app Agent
1213 Elo2026-08-22
Design Arena Web-app Agent
1213 Elo2026-08-23
Design Arena Web-app Agent
1207 Elo2026-08-28
Design Arena Web-app Agent
1208 Elo2026-08-24
Design Arena Web-app Agent
1208 Elo2026-08-25
Design Arena Web-app Agent
1209 Elo2026-08-26
Design Arena Web-app Agent
1206 Elo2026-08-29
Design Arena Web-app Agent
1205 Elo2026-08-30
Design Arena Web-app Agent
1205 Elo2026-08-31
Design Arena Web-app Agent
1205 Elo2026-09-01
Design Arena Web-app Agent
1205 Elo2026-09-02
Design Arena Web-app Agent
1205 Elo2026-09-03
Design Arena Web-app Agent
1205 Elo2026-09-04
Design Arena Website
1290 Elo2026-07-28
Design Arena Website
1290 Elo2026-07-30
Design Arena Website
1290 Elo2026-07-27
Design Arena Website
1290 Elo2026-07-29
Design Arena Website
1290 Elo2026-07-31
Design Arena Website
1290 Elo2026-08-02
Design Arena Website
1290 Elo2026-08-01
Design Arena Website
1290 Elo2026-08-05
Design Arena Website
1290 Elo2026-08-03
Design Arena Website
1290 Elo2026-08-09
Design Arena Website
1290 Elo2026-08-04
Design Arena Website
1290 Elo2026-08-14
Design Arena Website
1290 Elo2026-08-06
Design Arena Website
1290 Elo2026-08-07
Design Arena Website
1290 Elo2026-08-10
Design Arena Website
1290 Elo2026-08-08
Design Arena Website
1280 Elo2026-08-18
Design Arena Website
1290 Elo2026-08-11
Design Arena Website
1282 Elo2026-08-15
Design Arena Website
1290 Elo2026-08-12
Design Arena Website
1290 Elo2026-08-13
Design Arena Website
1280 Elo2026-08-19
Design Arena Website
1282 Elo2026-08-16
Design Arena Website
1280 Elo2026-08-20
Design Arena Website
1288 Elo2026-08-27
Design Arena Website
1281 Elo2026-08-17
Design Arena Website
1288 Elo2026-08-21
Design Arena Website
1289 Elo2026-08-22
Design Arena Website
1289 Elo2026-08-23
Design Arena Website
1289 Elo2026-08-24
Design Arena Website
1288 Elo2026-08-28
Design Arena Website
1288 Elo2026-08-25
Design Arena Website
1289 Elo2026-08-26
Design Arena Website
1287 Elo2026-08-29
Design Arena Website
1286 Elo2026-08-30
Design Arena Website
1286 Elo2026-08-31
Design Arena Website
1286 Elo2026-09-01
Design Arena Website
1285 Elo2026-09-02
Design Arena Website
1283 Elo2026-09-03
Design Arena Website
1282 Elo2026-09-04
LMArena Agent
1.22026-07-13
LMArena Agent
1.72026-07-20
LMArena Agent
0.72026-07-27
LMArena Agent
1.42026-07-21
LMArena Agent
0.42026-07-28
LMArena Agent
0.32026-08-03
LMArena Agent
0.62026-08-12
LMArena Agent
0.42026-08-06
LMArena Agent
0.52026-08-11
LMArena Agent
0.62026-08-13
LMArena Agent
-0.42026-08-24
LMArena Agent
-0.82026-08-27
LMArena Agent
-1.42026-08-31
LMArena Creative Writing
1456 Elo2026-07-21
LMArena Creative Writing
1454 Elo2026-07-27
LMArena Creative Writing
1454 Elo2026-07-30
LMArena Creative Writing
1453 Elo2026-08-02
LMArena Creative Writing
1453 Elo2026-08-03
LMArena Creative Writing
1454 Elo2026-08-06
LMArena Creative Writing
1454 Elo2026-08-12
LMArena Creative Writing
1454 Elo2026-08-21
LMArena Creative Writing
1454 Elo2026-08-27
LMArena Creative Writing
1452 Elo2026-09-01
LMArena Long Query
1470 Elo2026-07-21
LMArena Long Query
1471 Elo2026-07-27
LMArena Long Query
1471 Elo2026-07-30
LMArena Long Query
1470 Elo2026-08-02
LMArena Long Query
1470 Elo2026-08-03
LMArena Long Query
1470 Elo2026-08-06
LMArena Long Query
1468 Elo2026-08-12
LMArena Long Query
1470 Elo2026-08-21
LMArena Long Query
1469 Elo2026-08-27
LMArena Long Query
1468 Elo2026-09-01
LMArena Math
1476 Elo2026-07-21
LMArena Math
1479 Elo2026-07-27
LMArena Math
1479 Elo2026-07-30
LMArena Math
1479 Elo2026-08-02
LMArena Math
1479 Elo2026-08-03
LMArena Math
1479 Elo2026-08-06
LMArena Math
1478 Elo2026-08-12
LMArena Math
1475 Elo2026-08-21
LMArena Math
1474 Elo2026-08-27
LMArena Math
1474 Elo2026-09-01
LMArena Text
1466 Elo2026-07-16
LMArena Text
1470 Elo2026-07-21
LMArena Text
1469 Elo2026-07-27
LMArena Text
1469 Elo2026-07-30
LMArena Text
1469 Elo2026-08-02
LMArena Text
1468 Elo2026-08-06
LMArena Text
1469 Elo2026-08-03
LMArena Text
1467 Elo2026-08-10
LMArena Text
1468 Elo2026-08-21
LMArena Text
1467 Elo2026-08-12
LMArena Text
1466 Elo2026-08-27
LMArena Text
1466 Elo2026-09-01
LMArena WebDev
1526 Elo2026-07-16
LMArena WebDev
1526 Elo2026-07-21
LMArena WebDev
1525 Elo2026-07-20
LMArena WebDev
1518 Elo2026-07-27
LMArena WebDev
1520 Elo2026-07-24
LMArena WebDev
1518 Elo2026-07-28
LMArena WebDev
1518 Elo2026-07-30
LMArena WebDev
1516 Elo2026-08-01
LMArena WebDev
1516 Elo2026-07-31
LMArena WebDev
1515 Elo2026-08-06
LMArena WebDev
1516 Elo2026-08-02
LMArena WebDev
1511 Elo2026-08-12
LMArena WebDev
1511 Elo2026-08-10
LMArena WebDev
1510 Elo2026-08-14
LMArena WebDev
1509 Elo2026-08-21
LMArena WebDev
1509 Elo2026-08-30
LMArena WebDev
1509 Elo2026-09-01
SWE-rebench
62.7% ± 0.72026-03-01tools
SWE-rebench
50.7% ± 0.92026-05-15tools
Terminal-Bench 2.1
58.6% ± 1.22026-05-01max effort

LMArena data licensed CC-BY-4.0. Aider (Apache-2.0) and SWE-bench (MIT) are open. Design Arena uses blind human preference. Submitted scaffold plus model result. Compare the harness and effort settings, not only the model name.

Open-weight model on Hugging Face.

Task evidence

How broad is the support?

Each status is exact to this model version and the selected task. Official release claims remain provisional.

  • Best LLM for Frontend & UIEstablished evidence

    90% of intended weighted task evidence across 2 independent sources. 5 of 5 configured evaluation feeds currently have results.

  • Best LLM for Agentic CodingEstablished evidence

    72% of intended weighted task evidence across 4 independent sources. 8 of 8 configured evaluation feeds currently have results.

  • Best LLM for CodingEstablished evidence

    68% of intended weighted task evidence across 4 independent sources. 8 of 8 configured evaluation feeds currently have results.

  • Best LLM for Autonomous AgentsEstablished evidence

    65% of intended weighted task evidence across 3 independent sources. 7 of 7 configured evaluation feeds currently have results.

  • Best LLM for Hermes AgentEstablished evidence

    62% of intended weighted task evidence across 3 independent sources. 5 of 5 configured evaluation feeds currently have results.

  • Best LLM for OpenHandsEstablished evidence

    62% of intended weighted task evidence across 3 independent sources. 5 of 5 configured evaluation feeds currently have results.

  • Best LLM for GooseEstablished evidence

    62% of intended weighted task evidence across 3 independent sources. 5 of 5 configured evaluation feeds currently have results.

  • Best LLM for OpenClawEstablished evidence

    62% of intended weighted task evidence across 3 independent sources. 5 of 5 configured evaluation feeds currently have results.

  • Best LLM for Business WritingProvisional evidence

    70% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LiveBench Instruction Following. 5 of 5 configured evaluation feeds currently have results.

  • Best LLM for Marketing CopyProvisional evidence

    70% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LiveBench Instruction Following. 5 of 5 configured evaluation feeds currently have results.

  • Best LLM for Chat & RoleplayProvisional evidence

    70% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LiveBench Instruction Following or LiveBench Language. 5 of 5 configured evaluation feeds currently have results.

  • 70% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LiveBench Instruction Following or LiveBench Language. 5 of 5 configured evaluation feeds currently have results.

  • Best LLM for Creative WritingProvisional evidence

    60% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LiveBench Instruction Following or LiveBench Language. 5 of 5 configured evaluation feeds currently have results.

  • Best LLM for WritingProvisional evidence

    60% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LiveBench Instruction Following or LiveBench Language. 5 of 5 configured evaluation feeds currently have results.

  • 55% of intended weighted task evidence across 2 independent sources; broader independent confirmation is still missing from Aider Polyglot or LiveBench Coding. 6 of 6 configured evaluation feeds currently have results.

  • 55% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LiveBench Instruction Following or LiveBench Reasoning. 5 of 5 configured evaluation feeds currently have results.

  • 50% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LiveBench Instruction Following or LiveBench Reasoning. 5 of 5 configured evaluation feeds currently have results.

  • Best LLM for AI AgentsProvisional evidence

    50% of intended weighted task evidence across 3 independent sources; broader independent confirmation is still missing from Berkeley Function Calling or LiveBench Agentic Coding. 7 of 7 configured evaluation feeds currently have results.

  • Best LLM for Code CompletionProvisional evidence

    44% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from Aider Polyglot or LiveBench Coding. 4 of 4 configured evaluation feeds currently have results.

  • Best LLM for Competition MathProvisional evidence

    40% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LiveBench Mathematics or LiveBench Reasoning. 5 of 5 configured evaluation feeds currently have results.

  • Best LLM for Math & ReasoningProvisional evidence

    40% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LiveBench Mathematics or LiveBench Reasoning. 5 of 5 configured evaluation feeds currently have results.

  • Best Local LLM for CodingProvisional evidence

    40% of intended weighted task evidence across 2 independent sources; broader independent confirmation is still missing from Aider Polyglot or LiveBench Coding. 5 of 5 configured evaluation feeds currently have results.

  • Best Value LLMProvisional evidence

    36% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LiveBench Instruction Following or Route reliability. 3 of 4 configured evaluation feeds currently have results.

  • 33% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LiveBench Instruction Following or Route reliability. 3 of 4 configured evaluation feeds currently have results.

  • Best LLM for Fast SummariesProvisional evidence

    29% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LiveBench Instruction Following or Route reliability. 3 of 4 configured evaluation feeds currently have results.

  • 25% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LiveBench Instruction Following or LiveBench Language. 4 of 5 configured evaluation feeds currently have results.

  • Best Cheap LLM for High VolumeProvisional evidence

    25% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LiveBench Instruction Following or Route reliability. 3 of 4 configured evaluation feeds currently have results.

  • 25% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LiveBench Instruction Following or LiveBench Language. 4 of 5 configured evaluation feeds currently have results.

  • Cheapest Capable LLMProvisional evidence

    25% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LiveBench Instruction Following or Route reliability. 3 of 4 configured evaluation feeds currently have results.

  • Best LLM for TranslationProvisional evidence

    25% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LiveBench Instruction Following or LiveBench Language. 4 of 5 configured evaluation feeds currently have results.

  • 25% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from Berkeley Function Calling or LMArena Search. 4 of 5 configured evaluation feeds currently have results.

  • Best LLM for Massive ContextProvisional evidence

    25% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LMArena Document or LongBench v2. 3 of 4 configured evaluation feeds currently have results.

  • 25% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from Berkeley Function Calling or OSWorld Verified. 4 of 4 configured evaluation feeds currently have results.

  • 20% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from FACTS Grounding or LiveBench Instruction Following. 4 of 6 configured evaluation feeds currently have results.

  • Best LLM for SummarizationProvisional evidence

    20% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from FACTS Grounding or LiveBench Instruction Following. 4 of 6 configured evaluation feeds currently have results.

  • 18% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from FACTS Grounding or LMArena Document. 4 of 6 configured evaluation feeds currently have results.

  • 17% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from Berkeley Function Calling or LiveBench Data Analysis. 4 of 5 configured evaluation feeds currently have results.

  • 17% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from Berkeley Function Calling or LiveBench Data Analysis. 4 of 5 configured evaluation feeds currently have results.

  • 13% of intended weighted task evidence across 0 independent sources; broader independent confirmation is still missing from LiveBench Data Analysis or Route reliability. 2 of 4 configured evaluation feeds currently have results.

  • Best LLM for OCR & DocumentsProvisional evidence

    10% of intended weighted task evidence across 0 independent sources; broader independent confirmation is still missing from LMArena Document or LMArena Vision. 3 of 5 configured evaluation feeds currently have results.

  • 10% of intended weighted task evidence across 0 independent sources; broader independent confirmation is still missing from LiveBench Reasoning or LMArena Vision. 3 of 4 configured evaluation feeds currently have results.

  • 10% of intended weighted task evidence across 0 independent sources; broader independent confirmation is still missing from LMArena Document or LMArena Vision. 3 of 5 configured evaluation feeds currently have results.

  • Best LLM for Grounded RAGProvisional evidence

    10% of intended weighted task evidence across 0 independent sources; broader independent confirmation is still missing from CRAG or FACTS Grounding. 2 of 5 configured evaluation feeds currently have results.

  • Best LLM for Charts & DiagramsProvisional evidence

    10% of intended weighted task evidence across 0 independent sources; broader independent confirmation is still missing from LMArena Document or LMArena Vision. 3 of 5 configured evaluation feeds currently have results.

  • Best LLM for Document ParsingProvisional evidence

    10% of intended weighted task evidence across 0 independent sources; broader independent confirmation is still missing from LMArena Document or LMArena Vision. 3 of 5 configured evaluation feeds currently have results.

Recommendation coverage

Where this model appears

Not currently included in a published recommendation. The task evidence panel above says exactly what is confirmed and what is still missing.

Catalog data via OpenRouter and models.dev. Last checked within the past 6 hours.