Claude Opus 4.5
anthropic/claude-4.5-opus-20251124
Claude Opus 4.5, from Anthropic, accepts file, image, and text inputs and produces text output. It supports tool usage and reasoning, provides a context length of 200 000 tokens, and is priced at $5 per million input tokens and $25 per million output tokens. The model was released on 2025‑11‑24 and its weights are not open.
- tool use
- structured outputs
- reasoning
At a glance
Specifications
What the API gives you
- Context window
- 200K tokens
- Max output
- 64K tokens
- Input price
- $5 / 1M tokens
- Output price
- $25 / 1M tokens
- Cache read
- $0.50 / 1M tokens
- Modalities
- file, image, text → text
- Knowledge cutoff
- —
- Released
- Nov 1, 2025
Measured evidence
Public benchmark record
- BFCL
- 77.5%2026-10-21
- Design Arena Coding
- 1242 Elo2026-10-21
- Design Arena Full-stack Agent
- 1156 Elo2026-10-14
- Design Arena UI
- 1239 Elo2026-10-21
- Design Arena Web-app Agent
- 1159 Elo2026-10-21
- Design Arena Website
- 1248 Elo2026-10-21
- FACTS Grounding
- 62.1%2025-09-03evaluated 2025-09-03
- FrontierMath Tiers 1-3 (Epoch AI)
- 34.4% ± 2.82026-06-11evaluated 2026-06-11
- GPQA Diamond (Epoch AI)
- 85.5% ± 2.22025-11-25evaluated 2025-11-25
- GPQA Diamond (Epoch AI)
- 80.7% ± 2.42025-11-24evaluated 2025-11-24
- LiveBench Agentic Coding
- 39.7%2026-10-18
- LiveBench Coding
- 79.7%2026-10-18
- LiveBench Data Analysis
- 74.4%2026-10-18
- LiveBench Instruction Following
- 62.5%2026-10-18
- LiveBench Language
- 81.3%2026-10-18
- LiveBench Math
- 90.4%2026-10-18
- LiveBench Reasoning
- 80.1%2026-10-18
- LMArena Creative Writing
- 1445 Elo2026-10-20
- LMArena Instruction Following
- 1478 Elo2026-10-20
- LMArena Long Query
- 1478 Elo2026-10-20
- LMArena Math
- 1463 Elo2026-10-20
- LMArena Text
- 1474 Elo2026-10-20
- LMArena Text Factuality
- 1459 Elo2026-10-20
- LMArena WebDev
- 1494 Elo2026-10-19
- OTIS Mock AIME (Epoch AI)
- 48.1% ± 6.42025-11-24evaluated 2025-11-24
- SimpleQA Verified (Epoch AI)
- 45.7% ± 1.62026-08-27evaluated 2026-08-27
- SWE-bench Verified (verified-500)‡
- 76.8%2026-10-21mini-SWE-agent 2.0.0, high effort, evaluated 2026-02-17
- tau2-bench (1.0.1)‡
- 24.7%2026-05-05high effort, evaluated 2026-05-05
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 4 independent sources. 6 of 6 configured evaluation feeds currently have results.
- Best LLM for Business WritingEstablished evidence
100% of intended weighted task evidence across 2 independent sources. 4 of 4 configured evaluation feeds currently have results.
- Best LLM for Logic & Problem SolvingEstablished evidence
100% of intended weighted task evidence across 3 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. 4 of 4 configured evaluation feeds currently have results.
- Best LLM for Chat & RoleplayEstablished evidence
100% of intended weighted task evidence across 2 independent sources. 4 of 4 configured evaluation feeds currently have results.
- Best LLM for Creative WritingEstablished evidence
100% of intended weighted task evidence across 2 independent sources. 4 of 4 configured evaluation feeds currently have results.
Show all 45 tasks
- Best LLM for WritingEstablished evidence
100% of intended weighted task evidence across 2 independent sources. 4 of 4 configured evaluation feeds currently have results.
- Best LLM for Roleplay & CharacterEstablished evidence
100% of intended weighted task evidence across 2 independent sources. 4 of 4 configured evaluation feeds currently have results.
- Best LLM for Math & ReasoningEstablished evidence
100% of intended weighted task evidence across 5 independent sources. 7 of 7 configured evaluation feeds currently have results.
- Best LLM for a General AssistantEstablished evidence
100% of intended weighted task evidence across 3 independent sources. 6 of 6 configured evaluation feeds currently have results.
- Best LLM for Frontend & UIEstablished evidence
91% of intended weighted task evidence across 3 independent sources. 6 of 6 configured evaluation feeds currently have results.
- Best LLM for Document SummarizationEstablished evidence
85% of intended weighted task evidence across 3 independent sources. 5 of 6 configured evaluation feeds currently have results.
- Best LLM for SummarizationEstablished evidence
85% of intended weighted task evidence across 3 independent sources. 5 of 6 configured evaluation feeds currently have results.
- Best LLM for Code CompletionEstablished evidence
79% of intended weighted task evidence across 2 independent sources. 3 of 3 configured evaluation feeds currently have results.
- Best Open-Weight LLM for Self-HostingEstablished evidence
64% of intended weighted task evidence across 2 independent sources. 2 of 3 configured evaluation feeds currently have results.
- Best LLM for Grounded RAGEstablished evidence
62% of intended weighted task evidence across 3 independent sources. 5 of 7 configured evaluation feeds currently have results.
- Best LLM for RAG & Long ContextEstablished evidence
61% of intended weighted task evidence across 2 independent sources. 5 of 6 configured evaluation feeds currently have results.
- Best LLM for CodingEstablished evidence
60% of intended weighted task evidence across 4 independent sources. 7 of 7 configured evaluation feeds currently have results.
- Best LLM for Fast SummariesEstablished evidence
58% of intended weighted task evidence across 2 independent sources. 2 of 3 configured evaluation feeds currently have results.
- Best Value LLMEstablished evidence
58% of intended weighted task evidence across 2 independent sources. 2 of 3 configured evaluation feeds currently have results.
- Best LLM for JSON & Schema OutputEstablished evidence
53% of intended weighted task evidence across 3 independent sources. 3 of 4 configured evaluation feeds currently have results.
- Best LLM for Structured Data ExtractionEstablished evidence
53% of intended weighted task evidence across 3 independent sources. 3 of 4 configured evaluation feeds currently have results.
- Best LLM for Literary TranslationEstablished evidence
50% of intended weighted task evidence across 2 independent sources. 3 of 4 configured evaluation feeds currently have results.
- Best LLM for Everyday TranslationEstablished evidence
50% of intended weighted task evidence across 2 independent sources. 3 of 4 configured evaluation feeds currently have results.
- Best LLM for TranslationEstablished evidence
50% of intended weighted task evidence across 2 independent sources. 3 of 4 configured evaluation feeds currently have results.
- Best Local LLM for CodingEstablished evidence
47% of intended weighted task evidence across 2 independent sources. 4 of 4 configured evaluation feeds currently have results.
- Best LLM for Tool & Function CallingEstablished evidence
46% of intended weighted task evidence across 2 independent sources. 6 of 7 configured evaluation feeds currently have results.
- Best LLM for Debugging & Code ReviewEstablished evidence
44% of intended weighted task evidence across 3 independent sources. 5 of 5 configured evaluation feeds currently have results.
- Best Cheap LLM for High VolumeEstablished evidence
40% of intended weighted task evidence across 2 independent sources. 2 of 3 configured evaluation feeds currently have results.
- Cheapest Capable LLMEstablished evidence
40% of intended weighted task evidence across 2 independent sources. 2 of 3 configured evaluation feeds currently have results.
- Best LLM for AI AgentsEstablished evidence
36% of intended weighted task evidence across 3 independent sources. 9 of 9 configured evaluation feeds currently have results.
- Best LLM for Agentic CodingEstablished evidence
36% of intended weighted task evidence across 2 independent sources. 7 of 7 configured evaluation feeds currently have results.
- Best LLM for Massive ContextProvisional evidence
47% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LongBench v2. 2 of 3 configured evaluation feeds currently have results.
- Best LLM for Hermes AgentProvisional evidence
40% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LMArena Agent or SWE-rebench. 4 of 4 configured evaluation feeds currently have results.
- Best LLM for OpenHandsProvisional evidence
40% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LMArena Agent or SWE-rebench. 4 of 4 configured evaluation feeds currently have results.
- Best LLM for GooseProvisional evidence
40% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LMArena Agent or SWE-rebench. 4 of 4 configured evaluation feeds currently have results.
- Best LLM for OpenClawProvisional evidence
40% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LMArena Agent or SWE-rebench. 4 of 4 configured evaluation feeds currently have results.
- Best LLM for High-Volume ExtractionProvisional evidence
21% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from Route reliability or Structured-output eval. 1 of 3 configured evaluation feeds currently have results.
- Best LLM for Document ParsingProvisional evidence
21% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LMArena Vision or LMArena Vision OCR. 3 of 5 configured evaluation feeds currently have results.
- Best LLM for OCR & DocumentsProvisional evidence
20% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LMArena Vision or LMArena Vision OCR. 3 of 5 configured evaluation feeds currently have results.
- Best LLM for Vision & DocumentsProvisional evidence
20% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LMArena Vision or LMArena Vision Diagrams. 4 of 6 configured evaluation feeds currently have results.
- Best LLM for Charts & DiagramsProvisional evidence
20% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LMArena Vision or LMArena Vision Diagrams. 3 of 5 configured evaluation feeds currently have results.
- Best LLM for Autonomous AgentsProvisional evidence
13% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LMArena Agent or LMArena Agent Task Outcome. 6 of 6 configured evaluation feeds currently have results.
- Best LLM for Computer & Browser UseProvisional evidence
11% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LMArena Agent or OSWorld Verified. 3 of 3 configured evaluation feeds currently have results.
- Best LLM for Image UnderstandingProvisional evidence
11% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing from LMArena Vision or VLMEvalKit tasks. 2 of 3 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.