Claude Sonnet 5.5
BalancedLast verified: September 25, 2026· Anthropic Claude Sonnet 5.5 pricing
The current Sonnet. Adaptive thinking with recalibrated effort levels; 1M-token context window.
- Input / 1M
- $2.00
- Output / 1M
- $10.00
- 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 Sonnet 5.5
What Claude Sonnet 5.5 costs in practice
| Scenario | Input / mo | Output / mo | Est. cost / mo |
|---|---|---|---|
| Prototype | 2M | 0.5M | $9 |
| Growing product | 50M | 10M | $200 |
| At scale | 500M | 100M | $2,000 |
Plug in your own numbers with the cost calculator.
Where Claude Sonnet 5.5 fits in a routing setup
Cheaper alternatives to Claude Sonnet 5.5
The models immediately below Claude Sonnet 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 Sonnet 5.5 cost?
Claude Sonnet 5.5 bills $2.00 per million input tokens and $10.00 per million output tokens — $4.00 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 $200.
What is Claude Sonnet 5.5's context window?
Claude Sonnet 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 $2.00 at the input rate, before the reply is billed.
Where does Claude Sonnet 5.5 sit on price?
At $4.00 per million blended — three input tokens for every output token — Claude Sonnet 5.5 is dearer than 12 of the 19 models tracked here and cheaper than 6. Output bills at 5x the input rate, and the nearest cheaper model on this table is GPT-4.1 at $3.50 blended.
Related concepts: context window, model routing, prompt caching, evals.