Pricing · Claude
Claude Sonnet 5.5 pricing: API price, cost per message and plans
What Claude Sonnet 5.5 costs, three ways: Anthropic's API price per token, what Claude Sonnet 5.5's replies actually cost in our test runs, and how many Claude Sonnet 5.5 messages each llmwise plan includes. Every limit on Claude Sonnet 5.5 is on its model page.
API prices checked against OpenRouter's Claude Sonnet 5.5 page. Updated .
Short answer
Claude Sonnet 5.5's API price is $2.00 per million input tokens and $10.00 per million output tokens (Anthropic's list price, September 2026). In our 50 test runs a Claude Sonnet 5.5 reply cost $0.0038 on average (median $0.0034), from $0.0025 a reply on math to $0.0063 on coding. In llmwise you pay per message instead: up to 125 Claude Sonnet 5.5 messages a month on Pro ($20), 400 on Max ($50), 900 on Ultra ($100) and 2,000 on Studio ($200).
Claude Sonnet 5.5 API pricing
Claude Sonnet 5.5 through its API is billed per token: $2.00 in, $10.00 out per million tokens, as of September 2026.
| Input tokens | $2.00 per million |
|---|---|
| Output tokens | $10.00 per million |
| A typical Claude Sonnet 5.5 message (4,000 in, 700 out) | $0.0150 |
| 1,000 typical Claude Sonnet 5.5 messages | $15.00 |
| Typical Claude Sonnet 5.5 messages for $1 | 66 |
| Whose price | Anthropic's list price |
What a Claude Sonnet 5.5 reply cost in our test runs
We sent the same 50 test prompts to every model in llmwise on September 28, 2026, through OpenRouter with llmwise's own prompt and settings. Here's what each Claude Sonnet 5.5 reply cost, job by job.
| Job | Claude Sonnet 5.5, per reply | Per 1,000 replies | Tokens in / out | Passed |
|---|---|---|---|---|
| Coding | $0.0063 | $6.26 | 672 / 461 | 5 of 5 |
| Writing | $0.0034 | $3.41 | 554 / 225 | 4 of 5 |
| Math | $0.0025 | $2.47 | 538 / 139 | 5 of 5 |
| Summarization | $0.0034 | $3.35 | 692 / 165 | 4 of 5 |
| Data analysis | $0.0047 | $4.71 | 755 / 285 | 5 of 5 |
| Customer support | $0.0046 | $4.65 | 724 / 286 | 4 of 5 |
| Translation | $0.0042 | $4.23 | 605 / 274 | 5 of 5 |
| SQL | $0.0038 | $3.80 | 832 / 174 | 5 of 5 |
| RAG and answering from documents | $0.0028 | $2.79 | 904 / 56 | 5 of 5 |
| Agents and tool use | $0.0026 | $2.57 | 662 / 94 | 5 of 5 |
Across all 50 Claude Sonnet 5.5 replies: $0.0038 on average, $0.0034 at the median, $0.0017 for the cheapest and $0.0114 for the dearest. The Claude Sonnet 5.5 replies averaged 694 tokens in and 216 out, against the typical message's 4,000 in and 700 out: each test prompt starts a new chat, while a reply deep in a long chat rereads all of it.
Claude Sonnet 5.5 on each llmwise plan
In llmwise a Claude Sonnet 5.5 message is one of a published count, however long the reply runs, and you see what's left before you send.
Free: Claude Sonnet 5.5 is in the one-time trial of 5 messages, no card needed.
Pro, $20 a month: up to 125 Claude Sonnet 5.5 messages a month, which is $0.16 a Claude Sonnet 5.5 message if every message goes to Claude Sonnet 5.5.
Max, $50 a month: up to 400 Claude Sonnet 5.5 messages a month, which is $0.13 a Claude Sonnet 5.5 message if every message goes to Claude Sonnet 5.5.
Ultra, $100 a month: up to 900 Claude Sonnet 5.5 messages a month, which is $0.11 a Claude Sonnet 5.5 message if every message goes to Claude Sonnet 5.5.
Studio, $200 a month: up to 2,000 Claude Sonnet 5.5 messages a month, which is $0.10 a Claude Sonnet 5.5 message if every message goes to Claude Sonnet 5.5.
A $10 top-up adds up to 100 Claude Sonnet 5.5 messages, valid 12 months.
Every limit is published. Paid plans also have a monthly fair-use limit on AI cost: Pro $7.50, Max $20, Ultra $42, Studio $85. Using every message on your plan at typical sizes stays under it; very large messages and heavy research use it faster. Every limit, explained.
Claude Sonnet 5.5 against the other Claude models
Every Claude model in llmwise beside Claude Sonnet 5.5, dearest first.
| Model | API, per 1M in / out | Input price against Claude Sonnet 5.5 | Average reply in our runs | On Pro |
|---|---|---|---|---|
| Claude Fable 5.1Anthropic | $10.00 / $50.00 | 5 times Claude Sonnet 5.5's | $0.0200 | Up to 31 a month |
| Claude Opus 5.5Anthropic | $4.00 / $20.00 | 2 times Claude Sonnet 5.5's | $0.0107 | Up to 62 a month |
| Claude Sonnet 5.5AnthropicThis page | $2.00 / $10.00 | – | $0.0038 | Up to 125 a month |
| Claude Sonnet 5Anthropic | $2.00 / $10.00 | the same as Claude Sonnet 5.5's | $0.0041 | Up to 125 a month |
| Claude Haiku 4.5Anthropic | $1.00 / $5.00 | 50% of Claude Sonnet 5.5's | $0.0015 | Up to 250 a month |
Claude Sonnet 5.5's own page: Claude Sonnet 5.5: price, limits and messages on every plan. Claude Sonnet 5.5 passed 47 of the 50 test prompts these costs come from.
Questions
How much does a Claude Sonnet 5.5 message cost?
In our test runs, $0.0038 a reply on average through OpenRouter (median $0.0034), across 50 Claude Sonnet 5.5 replies to our test prompts. At the API price a typical Claude Sonnet 5.5 message of 4,000 tokens in and 700 out costs $0.0150; a long chat costs more, because every reply rereads it.
What is Claude Sonnet 5.5's API price?
$2.00 per million input tokens and $10.00 per million output tokens, as of September 2026 (Anthropic's list price).
How many Claude Sonnet 5.5 messages does llmwise Pro include?
Up to 125 Claude Sonnet 5.5 messages a month on Pro ($20 a month), if the whole allowance goes to Claude Sonnet 5.5; the count on each plan is above.
Can I use Claude Sonnet 5.5 for free?
Yes, to try: Claude Sonnet 5.5 is in llmwise's one-time free trial of 5 messages.
Claude, GPT, Gemini, DeepSeek, Grok, Kimi, and GLM, in one chat.
See what a message costs before you send it. Free is 5 messages to try; sign in with an email link, no password or card.