Claude Opus 4.8

anthropic/claude-4.8-opus-20260528

Claude Opus 4.8, from Anthropic, accepts text, image, and file inputs and generates text output. It provides a context length of 1,000,000 tokens, costs $5 per million input tokens and $25 per million output tokens, and supports both tool usage and reasoning. The model is not open‑weight and was released on 2026‑05‑28.

  • tool use
  • structured outputs
  • reasoning

At a glance

provideranthropic
releasedAug 26, 2025
context1M
input / M$5

Specifications

What the API gives you

Context window
1M tokens
Max output
128K tokens
Input price
$5 / 1M tokens
Output price
$25 / 1M tokens
Cache read
$0.50 / 1M tokens
Modalities
text, image, file → text
Knowledge cutoff
Released
Aug 26, 2025

Measured evidence

Public benchmark record

Design Arena Coding
1270 Elo2026-07-28
Design Arena Coding
1270 Elo2026-07-27
Design Arena Coding
1271 Elo2026-07-30
Design Arena Coding
1270 Elo2026-07-29
Design Arena Coding
1270 Elo2026-07-31
Design Arena Coding
1271 Elo2026-08-02
Design Arena Coding
1270 Elo2026-08-05
Design Arena Coding
1270 Elo2026-08-01
Design Arena Coding
1271 Elo2026-08-09
Design Arena Coding
1271 Elo2026-08-03
Design Arena Coding
1271 Elo2026-08-04
Design Arena Coding
1270 Elo2026-08-14
Design Arena Coding
1271 Elo2026-08-06
Design Arena Coding
1271 Elo2026-08-10
Design Arena Coding
1271 Elo2026-08-07
Design Arena Coding
1266 Elo2026-08-18
Design Arena Coding
1271 Elo2026-08-08
Design Arena Coding
1266 Elo2026-08-15
Design Arena Coding
1272 Elo2026-08-11
Design Arena Coding
1272 Elo2026-08-12
Design Arena Coding
1272 Elo2026-08-21
Design Arena Coding
1270 Elo2026-08-13
Design Arena Coding
1265 Elo2026-08-19
Design Arena Coding
1273 Elo2026-08-27
Design Arena Coding
1265 Elo2026-08-20
Design Arena Coding
1265 Elo2026-08-16
Design Arena Coding
1266 Elo2026-09-05
Design Arena Coding
1266 Elo2026-08-17
Design Arena Coding
1272 Elo2026-08-22
Design Arena Coding
1272 Elo2026-08-23
Design Arena Coding
1273 Elo2026-08-28
Design Arena Coding
1273 Elo2026-08-24
Design Arena Coding
1273 Elo2026-08-25
Design Arena Coding
1273 Elo2026-08-26
Design Arena Coding
1266 Elo2026-09-06
Design Arena Coding
1273 Elo2026-08-29
Design Arena Coding
1273 Elo2026-08-30
Design Arena Coding
1273 Elo2026-08-31
Design Arena Coding
1273 Elo2026-09-01
Design Arena Coding
1272 Elo2026-09-02
Design Arena Coding
1269 Elo2026-09-03
Design Arena Coding
1269 Elo2026-09-04
Design Arena UI
1277 Elo2026-07-28
Design Arena UI
1277 Elo2026-07-27
Design Arena UI
1277 Elo2026-07-30
Design Arena UI
1276 Elo2026-07-29
Design Arena UI
1278 Elo2026-07-31
Design Arena UI
1279 Elo2026-08-02
Design Arena UI
1279 Elo2026-08-01
Design Arena UI
1280 Elo2026-08-05
Design Arena UI
1280 Elo2026-08-09
Design Arena UI
1280 Elo2026-08-03
Design Arena UI
1280 Elo2026-08-04
Design Arena UI
1281 Elo2026-08-14
Design Arena UI
1282 Elo2026-08-06
Design Arena UI
1282 Elo2026-08-07
Design Arena UI
1280 Elo2026-08-10
Design Arena UI
1280 Elo2026-08-08
Design Arena UI
1282 Elo2026-08-18
Design Arena UI
1280 Elo2026-08-11
Design Arena UI
1280 Elo2026-08-15
Design Arena UI
1281 Elo2026-08-12
Design Arena UI
1282 Elo2026-08-13
Design Arena UI
1282 Elo2026-08-19
Design Arena UI
1280 Elo2026-08-16
Design Arena UI
1282 Elo2026-08-20
Design Arena UI
1280 Elo2026-08-27
Design Arena UI
1281 Elo2026-08-17
Design Arena UI
1277 Elo2026-09-05
Design Arena UI
1279 Elo2026-08-21
Design Arena UI
1280 Elo2026-08-22
Design Arena UI
1279 Elo2026-08-23
Design Arena UI
1281 Elo2026-08-28
Design Arena UI
1280 Elo2026-08-24
Design Arena UI
1281 Elo2026-08-25
Design Arena UI
1281 Elo2026-08-26
Design Arena UI
1277 Elo2026-09-06
Design Arena UI
1280 Elo2026-08-29
Design Arena UI
1279 Elo2026-08-30
Design Arena UI
1280 Elo2026-08-31
Design Arena UI
1281 Elo2026-09-01
Design Arena UI
1279 Elo2026-09-02
Design Arena UI
1278 Elo2026-09-03
Design Arena UI
1276 Elo2026-09-04
Design Arena Web-app Agent
1271 Elo2026-07-28
Design Arena Web-app Agent
1271 Elo2026-07-27
Design Arena Web-app Agent
1271 Elo2026-07-30
Design Arena Web-app Agent
1270 Elo2026-07-29
Design Arena Web-app Agent
1271 Elo2026-07-31
Design Arena Web-app Agent
1273 Elo2026-08-02
Design Arena Web-app Agent
1271 Elo2026-08-01
Design Arena Web-app Agent
1271 Elo2026-08-05
Design Arena Web-app Agent
1265 Elo2026-08-09
Design Arena Web-app Agent
1273 Elo2026-08-03
Design Arena Web-app Agent
1273 Elo2026-08-04
Design Arena Web-app Agent
1262 Elo2026-08-14
Design Arena Web-app Agent
1271 Elo2026-08-06
Design Arena Web-app Agent
1264 Elo2026-08-10
Design Arena Web-app Agent
1271 Elo2026-08-07
Design Arena Web-app Agent
1259 Elo2026-08-18
Design Arena Web-app Agent
1272 Elo2026-08-08
Design Arena Web-app Agent
1263 Elo2026-08-11
Design Arena Web-app Agent
1262 Elo2026-08-15
Design Arena Web-app Agent
1264 Elo2026-08-12
Design Arena Web-app Agent
1263 Elo2026-08-13
Design Arena Web-app Agent
1259 Elo2026-08-19
Design Arena Web-app Agent
1255 Elo2026-08-27
Design Arena Web-app Agent
1259 Elo2026-08-20
Design Arena Web-app Agent
1263 Elo2026-08-16
Design Arena Web-app Agent
1257 Elo2026-09-05
Design Arena Web-app Agent
1263 Elo2026-08-17
Design Arena Web-app Agent
1256 Elo2026-08-21
Design Arena Web-app Agent
1257 Elo2026-08-22
Design Arena Web-app Agent
1258 Elo2026-08-23
Design Arena Web-app Agent
1257 Elo2026-08-28
Design Arena Web-app Agent
1253 Elo2026-08-24
Design Arena Web-app Agent
1255 Elo2026-08-25
Design Arena Web-app Agent
1256 Elo2026-08-26
Design Arena Web-app Agent
1257 Elo2026-09-06
Design Arena Web-app Agent
1257 Elo2026-08-29
Design Arena Web-app Agent
1256 Elo2026-08-30
Design Arena Web-app Agent
1257 Elo2026-08-31
Design Arena Web-app Agent
1257 Elo2026-09-01
Design Arena Web-app Agent
1257 Elo2026-09-02
Design Arena Web-app Agent
1257 Elo2026-09-03
Design Arena Web-app Agent
1257 Elo2026-09-04
Design Arena Website
1268 Elo2026-07-28
Design Arena Website
1269 Elo2026-07-30
Design Arena Website
1268 Elo2026-07-27
Design Arena Website
1269 Elo2026-07-29
Design Arena Website
1268 Elo2026-07-31
Design Arena Website
1269 Elo2026-08-02
Design Arena Website
1268 Elo2026-08-01
Design Arena Website
1269 Elo2026-08-05
Design Arena Website
1269 Elo2026-08-03
Design Arena Website
1270 Elo2026-08-09
Design Arena Website
1270 Elo2026-08-04
Design Arena Website
1269 Elo2026-08-14
Design Arena Website
1270 Elo2026-08-06
Design Arena Website
1270 Elo2026-08-07
Design Arena Website
1271 Elo2026-08-10
Design Arena Website
1270 Elo2026-08-08
Design Arena Website
1262 Elo2026-08-18
Design Arena Website
1271 Elo2026-08-11
Design Arena Website
1261 Elo2026-08-15
Design Arena Website
1270 Elo2026-08-12
Design Arena Website
1269 Elo2026-08-13
Design Arena Website
1262 Elo2026-08-19
Design Arena Website
1261 Elo2026-08-16
Design Arena Website
1262 Elo2026-08-20
Design Arena Website
1272 Elo2026-08-27
Design Arena Website
1261 Elo2026-08-17
Design Arena Website
1269 Elo2026-09-05
Design Arena Website
1270 Elo2026-08-21
Design Arena Website
1271 Elo2026-08-22
Design Arena Website
1271 Elo2026-08-23
Design Arena Website
1271 Elo2026-08-24
Design Arena Website
1273 Elo2026-08-28
Design Arena Website
1272 Elo2026-08-25
Design Arena Website
1272 Elo2026-08-26
Design Arena Website
1267 Elo2026-09-06
Design Arena Website
1272 Elo2026-08-29
Design Arena Website
1272 Elo2026-08-30
Design Arena Website
1272 Elo2026-08-31
Design Arena Website
1272 Elo2026-09-01
Design Arena Website
1271 Elo2026-09-02
Design Arena Website
1269 Elo2026-09-03
Design Arena Website
1269 Elo2026-09-04
Frontier-Bench
21.1% ± 1.62026-07-12Claude Code, max effort
Frontier-Bench
23.6%2026-05-28Claude Code, max effort
LiveBench Coding
81.8%2026-06-25
LiveBench Language
79.7%2026-06-25
LiveBench Math
94.3%2026-06-25
LiveBench Reasoning
89.2%2026-06-25
LMArena Agent
9.32026-07-13
LMArena Agent
102026-07-20
LMArena Agent
9.52026-07-27
LMArena Agent
9.72026-07-21
LMArena Agent
9.42026-07-28
LMArena Agent
9.42026-08-06
LMArena Agent
9.22026-08-03
LMArena Agent
9.62026-08-12
LMArena Agent
9.52026-08-11
LMArena Agent
9.82026-08-13
LMArena Agent
102026-08-24
LMArena Agent
9.52026-08-31
LMArena Agent
9.22026-09-05
LMArena Agent
9.92026-08-27
LMArena Creative Writing
1447 Elo2026-07-21
LMArena Creative Writing
1449 Elo2026-07-27
LMArena Creative Writing
1449 Elo2026-07-30
LMArena Creative Writing
1449 Elo2026-08-02
LMArena Creative Writing
1449 Elo2026-08-03
LMArena Creative Writing
1450 Elo2026-08-06
LMArena Creative Writing
1452 Elo2026-08-12
LMArena Creative Writing
1450 Elo2026-08-21
LMArena Creative Writing
1448 Elo2026-09-02
LMArena Creative Writing
1449 Elo2026-08-27
LMArena Creative Writing
1448 Elo2026-09-01
LMArena Long Query
1486 Elo2026-07-21
LMArena Long Query
1486 Elo2026-07-27
LMArena Long Query
1486 Elo2026-07-30
LMArena Long Query
1486 Elo2026-08-02
LMArena Long Query
1486 Elo2026-08-03
LMArena Long Query
1486 Elo2026-08-06
LMArena Long Query
1485 Elo2026-08-12
LMArena Long Query
1483 Elo2026-08-21
LMArena Long Query
1482 Elo2026-09-02
LMArena Long Query
1482 Elo2026-08-27
LMArena Long Query
1482 Elo2026-09-01
LMArena Math
1489 Elo2026-07-21
LMArena Math
1486 Elo2026-07-27
LMArena Math
1486 Elo2026-07-30
LMArena Math
1485 Elo2026-08-02
LMArena Math
1485 Elo2026-08-03
LMArena Math
1483 Elo2026-08-06
LMArena Math
1485 Elo2026-08-12
LMArena Math
1485 Elo2026-08-21
LMArena Math
1488 Elo2026-09-01
LMArena Math
1486 Elo2026-08-27
LMArena Text
1462 Elo2026-07-16
LMArena Text
1472 Elo2026-07-20
LMArena Text
1484 Elo2026-07-21
LMArena Text
1484 Elo2026-07-27
LMArena Text
1484 Elo2026-07-30
LMArena Text
1484 Elo2026-08-02
LMArena Text
1483 Elo2026-08-06
LMArena Text
1484 Elo2026-08-03
LMArena Text
1482 Elo2026-08-10
LMArena Text
1482 Elo2026-08-21
LMArena Text
1482 Elo2026-08-12
LMArena Text
1482 Elo2026-09-01
LMArena Text
1482 Elo2026-09-02
LMArena Text
1481 Elo2026-08-27
LMArena Vision
1295 Elo2026-07-12
LMArena Vision
1286 Elo2026-07-21
LMArena Vision
1286 Elo2026-07-26
LMArena Vision
1286 Elo2026-07-30
LMArena Vision
1286 Elo2026-08-02
LMArena Vision
1284 Elo2026-08-06
LMArena Vision
1285 Elo2026-08-21
LMArena Vision
1285 Elo2026-08-27
LMArena WebDev
1562 Elo2026-07-16
LMArena WebDev
1565 Elo2026-07-21
LMArena WebDev
1564 Elo2026-07-20
LMArena WebDev
1568 Elo2026-07-27
LMArena WebDev
1568 Elo2026-07-24
LMArena WebDev
1568 Elo2026-07-28
LMArena WebDev
1568 Elo2026-07-30
LMArena WebDev
1566 Elo2026-08-01
LMArena WebDev
1567 Elo2026-07-31
LMArena WebDev
1565 Elo2026-08-06
LMArena WebDev
1566 Elo2026-08-02
LMArena WebDev
1564 Elo2026-08-10
LMArena WebDev
1564 Elo2026-08-12
LMArena WebDev
1564 Elo2026-08-14
LMArena WebDev
1563 Elo2026-09-01
LMArena WebDev
1563 Elo2026-09-05
LMArena WebDev
1563 Elo2026-08-21
LMArena WebDev
1563 Elo2026-08-30
OSWorld Verified
20.6%2026-06-24max effort
SWE-rebench
56.5% ± 1.22026-05-15tools
Terminal-Bench 2.1
78.9% ± 1.32026-07-09high effort
Terminal-Bench 2.1
23.6%2026-05-28max 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.

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 Competition MathEstablished evidence

    100% of intended weighted task evidence across 2 independent sources. 5 of 5 configured evaluation feeds currently have results.

  • Best LLM for Business WritingEstablished evidence

    100% of intended weighted task evidence across 2 independent sources. 5 of 5 configured evaluation feeds currently have results.

  • Best LLM for Agentic CodingEstablished evidence

    100% of intended weighted task evidence across 6 independent sources. 8 of 8 configured evaluation feeds currently have results.

  • 100% of intended weighted task evidence across 2 independent sources. 5 of 5 configured evaluation feeds currently have results.

  • Best LLM for Marketing CopyEstablished evidence

    100% of intended weighted task evidence across 2 independent sources. 5 of 5 configured evaluation feeds currently have results.

  • Best LLM for Autonomous AgentsEstablished evidence

    100% of intended weighted task evidence across 6 independent sources. 7 of 7 configured evaluation feeds currently have results.

  • Best LLM for Chat & RoleplayEstablished evidence

    100% of intended weighted task evidence across 2 independent sources. 5 of 5 configured evaluation feeds currently have results.

  • Best LLM for Creative WritingEstablished evidence

    100% of intended weighted task evidence across 2 independent sources. 5 of 5 configured evaluation feeds currently have results.

  • Best LLM for Frontend & UIEstablished evidence

    100% of intended weighted task evidence across 3 independent sources. 5 of 5 configured evaluation feeds currently have results.

  • Best LLM for WritingEstablished evidence

    100% of intended weighted task evidence across 2 independent sources. 5 of 5 configured evaluation feeds currently have results.

  • 100% of intended weighted task evidence across 2 independent sources. 5 of 5 configured evaluation feeds currently have results.

  • Best LLM for Math & ReasoningEstablished evidence

    100% of intended weighted task evidence across 2 independent sources. 5 of 5 configured evaluation feeds currently have results.

  • 100% of intended weighted task evidence across 2 independent sources. 5 of 5 configured evaluation feeds currently have results.

  • 90% of intended weighted task evidence across 2 independent sources. 4 of 4 configured evaluation feeds currently have results.

  • Best LLM for CodingEstablished evidence

    84% of intended weighted task evidence across 5 independent sources. 8 of 8 configured evaluation feeds currently have results.

  • Best LLM for Code CompletionEstablished evidence

    81% of intended weighted task evidence across 2 independent sources. 4 of 4 configured evaluation feeds currently have results.

  • 70% of intended weighted task evidence across 3 independent sources. 6 of 6 configured evaluation feeds currently have results.

  • Best LLM for AI AgentsEstablished evidence

    70% of intended weighted task evidence across 5 independent sources. 7 of 7 configured evaluation feeds currently have results.

  • 67% of intended weighted task evidence across 2 independent sources. 3 of 4 configured evaluation feeds currently have results.

  • 65% of intended weighted task evidence across 2 independent sources. 3 of 4 configured evaluation feeds currently have results.

  • Best Local LLM for CodingEstablished evidence

    64% of intended weighted task evidence across 3 independent sources. 5 of 5 configured evaluation feeds currently have results.

  • Best LLM for Fast SummariesEstablished evidence

    64% of intended weighted task evidence across 2 independent sources. 3 of 4 configured evaluation feeds currently have results.

  • Best Value LLMEstablished evidence

    64% of intended weighted task evidence across 2 independent sources. 3 of 4 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.

  • 60% of intended weighted task evidence across 2 independent sources. 4 of 6 configured evaluation feeds currently have results.

  • Best LLM for SummarizationEstablished evidence

    60% of intended weighted task evidence across 2 independent sources. 4 of 6 configured evaluation feeds currently have results.

  • 55% of intended weighted task evidence across 2 independent sources; broader independent confirmation is still missing from WMT translation. 4 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 WMT translation. 4 of 5 configured evaluation feeds currently have results.

  • Best LLM for TranslationProvisional evidence

    55% of intended weighted task evidence across 2 independent sources; broader independent confirmation is still missing from WMT translation. 4 of 5 configured evaluation feeds currently have results.

  • Best Cheap LLM for High VolumeProvisional evidence

    50% of intended weighted task evidence across 2 independent sources; broader independent confirmation is still missing from Route reliability. 3 of 4 configured evaluation feeds currently have results.

  • Cheapest Capable LLMProvisional evidence

    50% of intended weighted task evidence across 2 independent sources; broader independent confirmation is still missing from Route reliability. 3 of 4 configured evaluation feeds currently have results.

  • Best LLM for Massive ContextProvisional evidence

    50% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LongBench v2. 3 of 4 configured evaluation feeds currently have results.

  • 47% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from FACTS Grounding or LongBench v2. 4 of 6 configured evaluation feeds currently have results.

  • Best LLM for OCR & DocumentsProvisional evidence

    45% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from Structured-output eval or VLMEvalKit tasks. 3 of 5 configured evaluation feeds currently have results.

  • 45% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from Structured-output eval or VLMEvalKit tasks. 3 of 5 configured evaluation feeds currently have results.

  • Best LLM for Charts & DiagramsProvisional evidence

    45% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from Structured-output eval or VLMEvalKit tasks. 3 of 5 configured evaluation feeds currently have results.

  • Best LLM for Document ParsingProvisional evidence

    45% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from Structured-output eval or VLMEvalKit tasks. 3 of 5 configured evaluation feeds currently have results.

  • 39% of intended weighted task evidence across 2 independent sources; broader independent confirmation is still missing from Berkeley Function Calling or Structured-output eval. 4 of 5 configured evaluation feeds currently have results.

  • 39% of intended weighted task evidence across 2 independent sources; broader independent confirmation is still missing from Berkeley Function Calling or Structured-output eval. 4 of 5 configured evaluation feeds currently have results.

  • 35% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from Berkeley Function Calling or Structured-output eval. 4 of 5 configured evaluation feeds currently have results.

  • 31% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from Route reliability or Structured-output eval. 2 of 4 configured evaluation feeds currently have results.

  • Best LLM for Grounded RAGProvisional evidence

    30% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from CRAG or FACTS Grounding. 2 of 5 configured evaluation feeds currently have results.

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