Model tracker / Anthropic
Claude Opus 5.5
Claude Opus 5.5 is a frontier model from Anthropic, released 22 September 2026. At Anthropic it costs $4.00 per million input tokens and $20.00 per million output tokens, with a 1M-token context window.
- Made by
- Anthropic
- Released
- 2026-09-22
- Status
- Generally available, new
- Tier
- Frontier
- Weights
- Closed
- Context window
- 1,000,000 tokens
- Max output
- 128,000 tokens
- Input
- text, image, pdf
- API id
claude-opus-5-5
Claude Opus 5.5 price at Anthropic
US dollars per million tokens. Blended is 3 input tokens for every output token, one number to compare on.
| Provider | Input | Output | Cached input | Blended | Batch | Checked |
|---|---|---|---|---|---|---|
| Anthropic · maker | $4.00 | $20.00 | $0.20 | $8.00 | 50% off | 2026-10-15 |
- Anthropic: Cache writes 1.25x (5 min) or 2x (1 h) input. US-only inference (inference_geo: us) costs 1.1x. Full 1M context at standard price. Fast mode (research preview): $8 / $40.
Claude Opus 5.5 benchmarks
| Benchmark | Score | What it measures | Reported by |
|---|---|---|---|
| LMArena text score | 1504 | Elo-style score from people voting between answers | Independent |
Scores reported by a model's maker aren't independently checked.
Models like Claude Opus 5.5
Other frontier models closest in price, at each maker's own price or the cheapest provider.
| Model | Input | Output | Context | Weights |
|---|---|---|---|---|
| Claude Opus 5.5 | $4.00 | $20.00 | 1M | Closed |
| Muse Wonder Meta | $4.00 | $20.00 | 1M | Closed |
| Gemini 4 Argon Google | $2.00 | $10.00 | 1M | Closed |
| Claude Fable 5.1 Anthropic | $10.00 | $50.00 | 1M | Closed |
| GPT-6 Astra OpenAI | $10.00 | $50.00 | 1.1M | Closed |
| Mistral Large 4 Mistral AI | $0.68 | $2.09 | 1M | Open |
Compare them all in the model tracker →
Claude Opus 5.5 on dbggr
- Agent skill libraries compared: Superpowers, gstack, pstack, Anthropic's skills and six more, and whether to install one Article, 2026-10-14
- Use your Claude or ChatGPT plan for coding agents: which tools are allowed, what they do and what they cost Article, 2026-10-14
- Eight US states sue OpenAI as the EU opens its first AI Act test case over lab agents Daily, 2026-10-14
- Gemini 4 Argon is out for every developer at $2/$10, and doubles to Claude Opus 5.5's price on 1 December Daily, 2026-10-13
- Meta's Muse Wonder costs as much as Claude Opus 5.5: $4 in, $20 out per million tokens Daily, 2026-10-12
- Haiku 5.5 and four-cent decision models: the AI price war reaches the bottom tier Saturday edition, 2026-10-10
- How to write instructions for AI agents: what's tested and what's vibes Article, 2026-10-09
- Google launches the Gemini agent, one work agent that also runs Claude models Daily, 2026-10-08
Claude Opus 5.5 FAQ
How much does Claude Opus 5.5 cost?
Claude Opus 5.5 costs $4.00 per million input tokens and $20.00 per million output tokens at Anthropic, and $0.20 per million cached input tokens, with 50% off for batch requests. Prices are list prices in US dollars, last checked 15 October 2026.
What is Claude Opus 5.5's context window?
Claude Opus 5.5 takes up to 1,000,000 tokens in one request and writes up to 128,000 tokens in one response.
Is Claude Opus 5.5 open weight?
No. Claude Opus 5.5 is only available through Anthropic's API; Anthropic doesn't publish the weights.
Where can I use Claude Opus 5.5?
Claude Opus 5.5 is available from Anthropic. At Anthropic, call it as claude-opus-5-5.