One agent session
1M input tokens and 100K output tokens, no caching.
- Input1M x $4 = $4.00
- Output0.1M x $20 = $2.00
$6.00per session
Anthropic - Closed weights
Claude Opus 5.5 pricing and specs
Claude Opus 5.5 is a closed-weights model from Anthropic that costs $4 per 1M input tokens and $20 per 1M output tokens on the first-party API, with a 1M-token context window.
Last verified from platform.claude.com. All sources
- Input / 1M
- $4
- Output / 1M
- $20
- Context
- 1M tokens
- Weights
- Closed
Pricing per 1M tokens
| Item | Price / 1M tokens |
|---|---|
| Input | $4 |
| Output | $20 |
| Cache read | $0.20 |
| Cache write (5 minutes) | $5 |
| Cache write (1 hour) | $8 |
| Batch inputBatch requests | $2 |
| Batch outputBatch requests | $10 |
| Fast mode inputFast mode requests | $8 |
| Fast mode outputFast mode requests | $40 |
Note: Cache reads are 0.05x base input. Fast mode (research preview) is Claude API only and not available with the Batch API.
Specs
- Context window
- 1,000,000 tokens
- Max output
- 128,000 tokens
- Release date
- Provider
- Anthropic
- API model id
claude-opus-5-5- Vercel AI Gateway id
anthropic/claude-opus-5.5- Weights
- Closed weights
What Claude Opus 5.5 costs in practice
Worked from the standard list rates above, with the math shown so you can swap in your own token counts.
A chat app
10,000 requests a day at 2K input and 500 output tokens each.
- Input20M x $4 = $80.00
- Output5M x $20 = $100.00
$180.00per day
$5,400.00 per 30-day month
The same session at a 90% cache hit
90% of the input is read from the prompt cache. The one-time cache write premium is not included.
- Cached input0.9M x $0.20 = $0.18
- Uncached input0.1M x $4 = $0.40
- Output0.1M x $20 = $2.00
$2.58per session
Compare with
| Model | Input / 1M | Output / 1M |
|---|---|---|
| Claude Opus 5.5 (this page) | $4 | $20 |
| Claude Sonnet 5.5Anthropic | $2 | $10 |
| GLM-5.3Z.ai | $1.40 | $4.40 |
| Claude Haiku 5.5Anthropic | $0.10 | $0.50 |
| Claude Fable 5.1Anthropic | $10 | $50 |
Related reading
- Opus 5.5 vs Sonnet 5.5 vs Haiku 5.5: Which Claude Model to UseSonnet 5.5 is the default, Opus 5.5 is for open-ended long-horizon work, and Haiku 5.5 is for bounded steps and subagents. Prices, benchmarks, cost math.
- Claude Opus 5.5 Built a Browser 3D World: The Higgsfield MCP WorkflowClaude Opus 5.5 and Higgsfield MCP built an interactive 3D Library of Alexandria in the browser. The verified connector setup and where the workflow holds up.
- Opus 5.5 in Claude Code: The Playbook and Where It BreaksOpus 5.5 in Claude Code: what each playbook tip changes, from naming the finish line to CLAUDE.md stop rules, and where Hacker News says long runs go wrong.
- How to Use Jev: Every Way to Call It, the Opus 5.5 Pairing, and Laya vs Kev vs OllayaHow to use Jev from TypeSafe: every verified way to call it, the Jev + Claude Opus 5.5 coding-agent pattern, and how Laya, Kev, and Ollaya compare.
- GPT-6 Sol vs Claude Opus 5.5 vs Grok 4.7: The September 2026 Price WarGPT-6 Sol vs Claude Opus 5.5 vs Grok 4.7 pricing: verified per-token rates, cost-per-task math and a decision guide for the September 2026 price war.
- Claude Opus 5.5 Developer Guide: Pricing, API, Claude CodeClaude Opus 5.5 costs $4/$20 per million tokens with $0.20 cache reads. SDK examples, Claude Code setup, and when to pick it over Sonnet 5.5 or Haiku 5.5.
FAQ
How much does Claude Opus 5.5 cost per million tokens?
Claude Opus 5.5 costs $4 per 1M input tokens and $20 per 1M output tokens on Anthropic's first-party API, per platform.claude.com on October 9, 2026. Per 1M tokens, cache reads cost $0.20, and the batch rate is $2 input and $10 output.
What is Claude Opus 5.5's context window?
Claude Opus 5.5 has a 1,000,000-token context window and returns up to 128,000 output tokens per response.
Are Claude Opus 5.5's weights open?
No. Claude Opus 5.5 is a closed-weights model. You call it through Anthropic's API as claude-opus-5-5 or through Vercel AI Gateway as anthropic/claude-opus-5.5.
When was Claude Opus 5.5 released?
Anthropic released Claude Opus 5.5 on September 22, 2026.
Sources
Last verified from platform.claude.com.
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