Claude Sonnet 5.5 pricing: API and Claude plans
Claude Sonnet 5.5 costs $2 per million input tokens and $10 per million output, with a 1M context window. Through AIGROW API credit, it costs $1.50 and $7.50.
US dollars per million tokens, standard rate, shortest context band. In Claude, it comes with the free plan, and the cheapest paid plan with it is Pro at $20/mo. Plan prices read 20 October 2026.
- 1,000 support replies
- $10.00
- Cached input
- $0.10
- Context window
- 1,000,000 tokens
- Released
- 28 Sep 2026
- Weights
- Closed weights
From Anthropic’s own pages, 15 October 2026.
Claude Sonnet 5.5 costs $2 per million input tokens and $10 per million output tokens on Anthropic’s own API, and $0.10 for cached input. At those prices 1,000 support replies cost $10.00, the 16th most expensive of 42 priced models on our list.
In Claude: Claude Sonnet 5.5 is included in Free ($0/mo), Pro ($20/mo), Max 5x ($100/mo), Max 20x ($200/mo), Team Standard ($25/mo), Team Premium ($125/mo).
claude.com/pricing · Read 20 October 2026. Prices can differ by country and include or exclude tax depending on the country.
AIGROW API credit runs Claude Sonnet 5.5 at $1.50 / $7.50 per million input / output tokens, 25% below list price. See API credit
What a job costs
Three jobs, 1,000 runs of each, at the list price above, and where each puts Claude Sonnet 5.5 among the 42 models with a list price.
| Job | 1,000 runs | Among 42 |
|---|---|---|
| Support reply3,000 in, 400 out. | $10.00 | 16th most expensive |
| Document summary25,000 in, 1,000 out. | $60.00 | 16th most expensive |
| Agent task80,000 in (70,000 cached), 3,000 out. | $57.00 | 18th most expensive |
The token counts are ours, chosen to look like real work; the prices are Anthropic’s. All three jobs stay under 100,000 tokens a request, below every long-context surcharge on the list.
The small print
What the base rate above leaves out, copied from the maker’s pages: surcharges, discounts, promotions and cache pricing.
Cache read is 0.05x input on this model ($0.10). Cache write $2.50 (5 min) or $4 (1 h). Batch API 50% off. US-only inference bills 1.1x. Full context window billed at standard rates. Max output 128K.
Claude Sonnet 5.5 against the models it is weighed with
Each comparison puts both list prices side by side and costs the same three jobs on each.
- vs GPT-6.1 Sol
- The mid-tier models Anthropic and OpenAI now recommend, at the same $2 / $10 list price.
- vs Claude Sonnet 5
- Anthropic's new Sonnet against the one it replaces, at the same list price with a cheaper cache.
- vs Claude Opus 5.5
- Tests whether the new Opus is worth twice the price of the new Sonnet on everyday tasks.
- vs Gemini 3.8 Flash
- Anthropic's new workhorse against Google's, where Flash stays cheaper even after its 2027 price rise.
Other Anthropic models
| Model | Input | Output | Context | 1,000 replies |
|---|---|---|---|---|
| Claude Haiku 5.5Anthropic | $0.10 | $0.50 | 1M | $0.50 |
| Claude Haiku 4.5AnthropicNewer model: Claude Haiku 5.5 | $1.00 | $5.00 | 200K | $5.00 |
| Claude Sonnet 5AnthropicNewer model: Claude Sonnet 5.5 | $2.00 | $10.00 | 1M | $10.00 |
| Claude Sonnet 4.6AnthropicNewer model: Claude Sonnet 5.5 | $3.00 | $15.00 | 1M | $15.00 |
| Claude Opus 5.5Anthropic | $4.00 | $20.00 | 1M | $20.00 |
| Claude Opus 5AnthropicNewer model: Claude Opus 5.5 | $5.00 | $25.00 | 1M | $25.00 |
| Claude Fable 5.1Anthropic | $10.00 | $50.00 | 1M | $50.00 |
Where the price comes from
Read on 15 October 2026. Each price is the standard rate for the shortest context band, with no batch or priority discount; long-context surcharges, batch rates and promotions are in each model’s small print. No price was taken from a reseller.
Run Claude Sonnet 5.5 up to 25% below list price
Through AIGROW API credit, Claude Sonnet 5.5 costs $1.50 / $7.50 per million input / output tokens against $2.00 / $10.00 at list, and $25 buys $100 of credit. The model id is claude-sonnet-5.5.
Prices checked 15 October 2026 · See them by release date