Claude Opus 4.5 API pricing
Anthropic model · Anthropic on AIWiseRank
Short answer
Claude Opus 4.5 by Anthropic costs $5 per 1M input tokens and $25 per 1M output tokens, with a 200K token context window. It scores 76.4% on SWE-bench Verified. GLM-5.3 Flash scores about as well on SWE-bench Verified (92%) for $0.24 per 1M blended tokens versus $10.
Prices updated Oct 23, 2026 (APIpulse, CC BY 4.0) · Benchmarks: ARC Prize, Vals.ai · all models
API cost calculator
Enter your monthly usage in millions of tokens (1M tokens ≈ 750,000 words).
Standard rates; batch processing and prompt caching can lower the bill.
Benchmarks
Cheaper models with similar scores
Within 3 points on the same benchmark, at a lower blended price.
- GLM-5.3 FlashSWE-bench Verified 92% · $0.24 / 1M
- GPT-5.6 LunaSWE-bench Verified 93% · $0.45 / 1M
- Gemini 3.5 Flash-LiteSWE-bench Verified 75% · $0.85 / 1M
Other Anthropic models
| Model | Input / 1M | Output / 1M |
|---|---|---|
| Claude Opus 5.5 | $4 | $20 |
| Claude Sonnet 5.5 | $2 | $10 |
| Claude Haiku 5.5 | $0.10 | $0.50 |
| Claude Fable 5.1 | $10 | $50 |
| Claude Fable 5 | $10 | $50 |
| Claude Mythos 5 | $10 | $50 |
| Claude Opus 5 | $5 | $25 |
| Claude Sonnet 5 | $2 | $10 |
Frequently asked questions
How much does the Claude Opus 4.5 API cost?
Claude Opus 4.5 costs $5 per 1M input tokens and $25 per 1M output tokens. A workload of 10M input and 2M output tokens a month costs $100.
What is the context window of Claude Opus 4.5?
Claude Opus 4.5 supports a 200K token context window.
Is there a cheaper alternative to Claude Opus 4.5?
GLM-5.3 Flash scores 92% on SWE-bench Verified, close to Claude Opus 4.5, at $0.24 per 1M blended tokens versus $10.