Pricing · Anthropic

Claude Sonnet 5.5

Anthropic's claude-sonnet-5-5, 1M tokens of context. Every number on this page was read off Anthropic's own pricing page — never estimated, never recalled from memory.

How Anthropic describes it

“Claude Sonnet 5.5 offers the best combination of speed and intelligence.”

Pricing

At the calculator's starting volume, 1M input tokens and 200K output tokens with no cache hits, Claude Sonnet 5.5 costs $4.00: $2.00 for input and $2.00 for output, at the prices above. Same formula as the calculator; change the volume there.

Where this price sits

$2.00 per 1M input tokens is the 39th cheapest input price of the 67 current models with a verified price on this site, and the 2nd of Anthropic's 14. Output costs 5.0× the input price.

Other current models in the Sonnet family:

• Claude Sonnet 5 1M tokens $2.00 in · $10.00 out
• Claude Sonnet 4.6 1M tokens $3.00 in · $15.00 out

Other price lists Anthropic publishes for Claude Sonnet 5.5

The prices above are Anthropic's Standard list, the one the table and the calculator use. Anthropic also sells Claude Sonnet 5.5 on one other list, each with a condition. Figures and wording are quoted from Anthropic's own pages as read on the date shown; this site computes none of them.

• Batch · 50% discount on both input and output tokens · wait: results when the batch completes or after 24 hours

  Printed for Claude Sonnet 5.5: $1.00 input, $5.00 output, per 1M tokens.

  The Batch API allows asynchronous processing of large volumes of requests with a 50% discount on both input and output tokens. You can access batch results when all messages have completed or after 24 hours, whichever comes first.

  Source, read September 29, 2026

Mentioned in

One post on this site cites Claude Sonnet 5.5. The sentence is the post's own, taken from where it links here.

• Same List Price, Different Bill: Five Pairs of LLM APIs Where the Workload Decides What You Pay · September 30, 2026

  Claude Sonnet 5.5 (verified September 29, 2026) and GPT-6.1 Sol (verified September 30, 2026) share the list price, $2.00 / $10.00.

Succession

Anthropic names Claude Sonnet 5.5 as the replacement for:

• Claude Sonnet 4.5 deprecated shutdown November 30, 2026

Against Claude Sonnet 5

Claude Sonnet 5 is the earlier version of the same name in this dataset (still current). Claude Sonnet 5.5 has the same prices as Claude Sonnet 5: input price ($2.00), output price ($10.00), cached input price ($0.20) per 1M tokens. Its prices were verified September 28, 2026: Claude Sonnet 5 pricing →

Specifications

Claude Sonnet 5.5 was released on September 28, 2026. It returns up to 128K tokens per response, against a context window of 1M tokens. Anthropic has committed not to retire it before September 28, 2027; no firm date is announced.

Questions about Claude Sonnet 5.5 pricing

How much does Claude Sonnet 5.5 cost per million tokens?

$2.00 per 1M input tokens and $10.00 per 1M output tokens, read on Anthropic's official pricing page on September 29, 2026.

What does a cached input token cost on Claude Sonnet 5.5?

$0.20 per 1M cached input tokens, 10% of the $2.00 input price; a 5-minute cache write costs $2.50, a 1-hour cache write costs $4.00 per 1M tokens.

Released September 28, 2026 (model page: 'Released September 28, 2026'; platform release notes, September 28, 2026: 'We've launched Claude Sonnet 5.5 ( claude-sonnet-5-5 ). It's available on the Claude API, Claude in Amazon Bedrock, Claude Platform on AWS, Claude on Google Cloud, and Claude in Microsoft Foundry.'). Read on 2026-09-29 from the text of Anthropic's general pricing page, 'Model pricing' table: 'Claude Sonnet 5.5 The best combination of speed and intelligence | $2 / MTok | $10 / MTok | $2.50 / MTok | $4 / MTok | $0.20 / MTok' (input, output, 5-minute cache write, 1-hour cache write, cache read), the same prices as Claude Sonnet 5, which the page moved the same day to 'Additional models'. Model page, read the same day: 'Context window 1M tokens', 'Max output 128K tokens', 'Max output (Batch API, beta) 300K tokens', 'Reliable knowledge cutoff Jun 2026', 'Retirement Not sooner than September 28, 2027'; the deprecations page lists it 'Active'. Batch API discount (batchDiscount 0.5) verified on 2026-09-29 against the same pricing page, 'Batch processing' section: 'The Batch API allows asynchronous processing of large volumes of requests with a 50% discount on both input and output tokens', table row 'Claude Sonnet 5.5 The best combination of speed and intelligence | $1 / MTok | $5 / MTok'. Not listed under Fast mode.

Verified September 29, 2026 against Anthropic's official pricing page. Confidence: confirmed. No price change recorded for this model. How the data is checked.

Other Anthropic models with a verified price

• Claude Haiku 4.5 Haiku $1.00 in · $5.00 out
• Claude Sonnet 5 Sonnet $2.00 in · $10.00 out
• Claude Sonnet 4.6 Sonnet $3.00 in · $15.00 out
• Claude Opus 5.5 Opus $4.00 in · $20.00 out
• Claude Opus 5 Opus $5.00 in · $25.00 out
• Claude Opus 4.8 Opus $5.00 in · $25.00 out
• Claude Opus 4.7 Opus $5.00 in · $25.00 out
• Claude Opus 4.6 Opus $5.00 in · $25.00 out
• Claude Opus 4.5 Opus $5.00 in · $25.00 out
• Claude Fable 5.1 Fable $10.00 in · $50.00 out
• Claude Mythos 5.1 Mythos $10.00 in · $50.00 out
• Claude Fable 5 Fable $10.00 in · $50.00 out
• Claude Mythos 5 Mythos $10.00 in · $50.00 out

Cheaper or equally priced alternatives

Current models with an input price at or below $2.00 per 1M tokens.

• GPT-6.1 Sol OpenAI $2.00 in · $10.00 out
• GPT-6 Sol OpenAI $2.00 in · $10.00 out
• GPT-5.6 Terra OpenAI $2.00 in · $12.00 out
• Claude Sonnet 5 Anthropic $2.00 in · $10.00 out

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