Anthropic · Released Feb 5, 2026Claude Opus 4.6
High-end Claude for difficult coding, planning, and slower expert reasoning.
- Capability
- 155.3ECI · #27 of 148
- Input
- $5.00per 1M tokens
- Output
- $25.00per 1M tokens
- Context
- 1M128K max output
What it costs
- Input
- $5.00per million tokens
- Output
- $25.00per million tokens
- Cached input
- $0.50per million tokens
- Cache write
- $6.25per million tokens
- Blended (3:1)
- $10.00pricier than 93% of priced models
Typical monthly bills
| Monthly usage | Estimated cost |
|---|---|
| Side project2M input + 0.5M output tokens | $22.50 |
| Team assistant25M input + 5M output tokens | $250.00 |
| Production app250M input + 50M output tokens | $2,500 |
Official Anthropic API price, as listed on models.dev.
Independent benchmarks
#27 of 148 scored models
The shaded band is Epoch AI’s confidence range (153.4–157.3); the tick marks the median scored model.
Scores from Epoch AI, run independently of Anthropic.
The details
- Lab
- Anthropic
- Released
- Feb 5, 2026
- Knowledge cutoff
- May 31, 2025
- Context window
- 1,000,000 tokens
- Max output
- 128,000 tokens
- Inputs
- Text, Images, PDFs
- Output
- Text
- Reasoning
- Adjustable effort low · medium · high · max
- Tool calling
- Yes
- Structured output
- Yes
- Weights
- Proprietary
- API model ID
claude-opus-4-6on Anthropic- Availability
- 33 API providerslisted on models.dev
What Anthropic claims
Published by the lab at launch. Settings vary, so compare these only with care.
| Benchmark | Score | Setting | Source |
|---|---|---|---|
| SWE-Bench Pro | 51.9 resolve rate | — | Source |
| SWE-Atlas Codebase QnA | 33.3 | — | Source |
| SWE-Atlas Codebase QnA | 30 | — | Source |
| SWE-Atlas Refactoring | 35.58 | — | Source |
| SWE-Atlas Test Writing | 36.67 | — | Source |
| SWE-Atlas Test Writing | 36.08 | — | Source |
| Artificial Analysis Coding Agent Index | 51.3 | medium | Source |
| SWE-Atlas Codebase QnA | 71.9 | medium | Source |
| SWE-Bench Pro | 11.8 | medium | Source |
| Terminal-Bench v2.1 | 70.2 | medium | Source |
More from Anthropic
About Claude Opus 4.6
How much does Claude Opus 4.6 cost?
Claude Opus 4.6 costs $5.00 input / $25.00 output per million tokens (official Anthropic API price). Cached input is $0.50 per million tokens, and writing to the cache costs $6.25. At a 3:1 input-to-output mix that is $10.00 per million tokens, more expensive than 93% of the 360 priced models we track.
What is the context window of Claude Opus 4.6?
Claude Opus 4.6 accepts up to 1,000,000 tokens per request and can write up to 128,000 tokens in one response.
How good is Claude Opus 4.6?
Epoch AI gives Claude Opus 4.6 a Capabilities Index score of 155.3 (likely range 153.4–157.3), ranking it #27 of 148 models Epoch has scored. Epoch AI benchmark results: GPQA Diamond 90.5%, FrontierMath Tiers 1–3 66.0%, OTIS Mock AIME 2024–2025 94.4%, SWE-bench Verified 78.7%, SimpleQA Verified 47.0%.
Is Claude Opus 4.6 open source?
No. Claude Opus 4.6 is proprietary; you use it through Anthropic’s API or partner platforms.
What inputs does Claude Opus 4.6 support?
Claude Opus 4.6 accepts text, images and PDFs and replies in text. It is a reasoning model with low, medium, high and max effort settings, supports tool calling and can return structured JSON output.
When was Claude Opus 4.6 released?
Anthropic released Claude Opus 4.6 on Feb 5, 2026. Its training data runs to May 31, 2025.
What are the best alternatives to Claude Opus 4.6?
The closest current models from other labs on capability, price and release date are Gemini 3.1 Pro Preview (Google, ECI 154.8, $2.00 / $12.00), GPT-5.4 (OpenAI, ECI 156.9, $2.50 / $15.00), Kimi K3 (Moonshot AI, ECI 157.6, $3.00 / $15.00) and Qwen3.7 Max (Alibaba (Qwen), ECI 153.7, $2.50 / $7.50).