Anthropic: Claude Sonnet 5.5 — pricing & benchmarks

By anthropic · Updated 2026-10-04 · Reads imageslong-context / RAGreads images / documentsstep-by-step reasoning

What Anthropic: Claude Sonnet 5.5 is used for

Anthropic: Claude Sonnet 5.5 is best suited for long-context / RAG, reads images / documents, step-by-step reasoning. Access it through one Appmo API key alongside 458 other models — Appmo's optimizer can route to it automatically when it is the best value for a request.

What people are saying (last 30 days)

Not enough posts yet to judge community sentiment. 2 Hacker News stories (8 points) · 31 new GitHub repos mentioning it. How we measure this.

• Claude Sonnet 5.5 for code review: More catches than Sonnet 5, in half the time — Hacker News, 4 pts, 0 comments
• Claude Sonnet 5.5 (Max Effort) Intelligence, Performance and Price Analysis — Hacker News, 4 pts, 0 comments

Use it via the Appmo API (OpenAI-compatible)

curl https://appmo.com/v1/chat/completions \
  -H "Authorization: Bearer $APPMO_KEY" \
  -d '{"model":"anthropic/claude-sonnet-5.5","messages":[{"role":"user","content":"Hello"}]}'

FAQ

How much does Anthropic: Claude Sonnet 5.5 cost?
Anthropic: Claude Sonnet 5.5 costs $2 per 1M input tokens and $10 per 1M output tokens ($4 blended), as of 2026-10-04. Prices are expected to fall as competition increases.

What is Anthropic: Claude Sonnet 5.5 best for?
Anthropic: Claude Sonnet 5.5 is best suited for long-context / RAG, reads images / documents, step-by-step reasoning.

How do I use Anthropic: Claude Sonnet 5.5?
Send requests to Appmo's OpenAI-compatible endpoint with model id "anthropic/claude-sonnet-5.5" and one API key — no separate provider account needed.

Is Anthropic: Claude Sonnet 5.5 open source?
We have no record of public weights for Anthropic: Claude Sonnet 5.5; treat it as a closed model available only through its provider's API.

Can Anthropic: Claude Sonnet 5.5 create images?
No. Anthropic: Claude Sonnet 5.5 can read and understand images, but it only writes text.