Claude Opus 5.5
FrontierLast verified: September 25, 2026· Anthropic Claude Opus 5.5 pricing
The current Opus. Thinking is always on and controlled by effort (default medium); 1M-token context window.
- Input / 1M
- $4.00
- Output / 1M
- $20.00
- Context
- 1M tokens
- Provider
- Anthropic
Pricing verified September 25, 2026. Prices change frequently. Always confirm against the provider’s official pricing page before relying on these figures for budgeting. Official pricing →
When to choose Claude Opus 5.5
What Claude Opus 5.5 costs in practice
| Scenario | Input / mo | Output / mo | Est. cost / mo |
|---|---|---|---|
| Prototype | 2M | 0.5M | $18 |
| Growing product | 50M | 10M | $400 |
| At scale | 500M | 100M | $4,000 |
Plug in your own numbers with the cost calculator.
Where Claude Opus 5.5 fits in a routing setup
Cheaper alternatives to Claude Opus 5.5
The models immediately below Claude Opus 5.5 on blended cost, nearest first. A swap only pays if quality holds on the routes you move — see the LLM cost optimization playbook for how to prove that before you move them.
Frequently asked questions
How much does Claude Opus 5.5 cost?
Claude Opus 5.5 bills $4.00 per million input tokens and $20.00 per million output tokens — $8.00 per million blended at a three-to-one input:output split. A workload of 50M input and 10M output tokens per month works out at about $400.
What is Claude Opus 5.5's context window?
Claude Opus 5.5 has a 1M-token context window, of which up to 128K tokens can be the reply. One request that fills the whole window costs about $4.00 at the input rate, before the reply is billed.
Where does Claude Opus 5.5 sit on price?
At $8.00 per million blended — three input tokens for every output token — Claude Opus 5.5 is dearer than 15 of the 19 models tracked here and cheaper than 3. Output bills at 5x the input rate, and the nearest cheaper model on this table is Claude Sonnet 4.6 at $6.00 blended.
Related concepts: context window, model routing, prompt caching, evals.