Anthropic · Released Nov 24, 2025Claude Opus 4.5
Flagship Claude model for deep reasoning, coding, and long-horizon agents.
- Capability
- 150.1ECI · #48 of 148
- Input
- $5.00per 1M tokens
- Output
- $25.00per 1M tokens
- Context
- 200K64K 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
#48 of 148 scored models
The shaded band is Epoch AI’s confidence range (147.9–153.0); the tick marks the median scored model.
Scores from Epoch AI, run independently of Anthropic.
The details
- Lab
- Anthropic
- Released
- Nov 24, 2025
- Knowledge cutoff
- May 2025
- Context window
- 200,000 tokens
- Max output
- 64,000 tokens
- Inputs
- Text, Images, PDFs
- Output
- Text
- Reasoning
- Adjustable effort low · medium · high
- Tool calling
- Yes
- Structured output
- Yes
- Weights
- Proprietary
- API model ID
claude-opus-4-5on Anthropic- Availability
- 28 API providerslisted on models.dev
More from Anthropic
About Claude Opus 4.5
How much does Claude Opus 4.5 cost?
Claude Opus 4.5 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 4.5?
Claude Opus 4.5 accepts up to 200,000 tokens per request and can write up to 64,000 tokens in one response.
How good is Claude Opus 4.5?
Epoch AI gives Claude Opus 4.5 a Capabilities Index score of 150.1 (likely range 147.9–153.0), ranking it #48 of 148 models Epoch has scored. Epoch AI benchmark results: GPQA Diamond 86.1%, FrontierMath Tiers 1–3 34.4%, OTIS Mock AIME 2024–2025 86.1%, SWE-bench Verified 76.7%, SimpleQA Verified 45.7%.
Is Claude Opus 4.5 open source?
No. Claude Opus 4.5 is proprietary; you use it through Anthropic’s API or partner platforms.
What inputs does Claude Opus 4.5 support?
Claude Opus 4.5 accepts text, images and PDFs and replies in text. It is a reasoning model with low, medium and high effort settings, supports tool calling and can return structured JSON output.
When was Claude Opus 4.5 released?
Anthropic released Claude Opus 4.5 on Nov 24, 2025. Its training data runs to May 2025.
What are the best alternatives to Claude Opus 4.5?
The closest current models from other labs on capability, price and release date are GPT-5.1 (OpenAI, ECI 149.7, $1.25 / $10.00), Gemini 3 Pro Preview (Google, ECI 153.0, $2.00 / $12.00), Inkling (Thinking Machines, ECI 148.6, $3.74 / $9.36) and Qwen3.6 Max Preview (Alibaba (Qwen), ECI 149.2, $1.30 / $7.80).