Model
Model explorer

Claude Opus 4.1

CLOSED
Anthropic · Claude 4 family · released Aug 5, 2025

Incremental Opus 4 upgrade improving agentic coding, refactoring and reasoning benchmarks; drop-in replacement at same price.

ReasoningCodingVisionFunction callingTool useAgentic
1760.6
Elo · rank #81
Parameters
Undisclosed
Active params
—
Context
200K tokens
Architecture
Dense transformer, hybrid-reasoning (parameter count undisclosed)
License
Proprietary
Languages
—
API price (in/out)
$15 / $75
Modalities
text · vision
Benchmark results
Bar shows position within the tracked field; marker = field best
AIMEMath78.0%#84
best: GPT-5.2 · 100.0%
Arena EloHuman preference1447#10
best: Claude Fable 5 · 1505
GAIAAgents64.2%#3
best: MiniMax-M2 · 75.7%
GPQA DiamondReasoning80.9%#76
best: GPT-5.6 · 94.6%
Humanity's Last ExamReasoning7.9%#100
best: Claude Sonnet 5 · 57.4%
LiveCodeBenchCoding64.6%#87
best: DeepSeek-V4-Pro (Think Max) · 93.5%
MMMLUKnowledge89.5%#7
best: Gemini 3.1 Pro · 92.6%
MMMUVision77.1%#30
best: Claude Fable 5 · 89.3%
OSWorldAgents44.4%#3
best: Seed 2.1 Pro · 78.8%
SWE-bench VerifiedCoding74.5%#43
best: Claude Fable 5 · 95.0%
tau-benchAgents82.4%#1
best: this model · 82.4%
Terminal-Bench 2.0Coding46.5%#51
best: GPT-5.6 · 88.8%
Terminal-BenchCoding43.3%#4
best: Claude Opus 4.5 (High) · 59.3%
Run it locally
Closed weights — available via API only. No local deployment.
Input / M tok
$15
Output / M tok
$75
Claude 4 family
Elo progression across releases
Claude Opus 4May 20251702.9Claude Sonnet 4May 20251594.8Claude Opus 4.1Aug 20251760.6Claude Sonnet 4.5Sep 20251976.7Claude Haiku 4.5Oct 20251590.8Claude Opus 4.5Nov 20252274.5Claude Opus 4.5 (High)Nov 20252301.0Claude Opus 4.5 (Medium)Nov 20252283.3Claude Opus 4.6Feb 20262459.4Claude Sonnet 4.6Feb 20262437.8Claude Opus 4.7Apr 20262702.0Claude Opus 4.8May 20262794.3
Resources
DOCSplatform.claude.comAPIAvailable via Anthropic API
API price $15/$75 · each benchmark row carries its own source badge (see methodology)