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Is Claude Sonnet 5.5 dumber today?
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| Day | Lobotomized | Dumb | Meh | Solid | Big brain |
|---|
Claude Sonnet 5.5 discussions
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What Claude Sonnet 5.5 costs
- Input
- $2.00 /1M tokens
- Output
- $10.00 /1M tokens
- Cached input
- $0.10 /1M tokens
- Context window
- 1M tokens
- Released
- September 28, 2026
Batch API: 50% off input and output.
| 1,000 chat messages1,500 tokens in, 500 out each | $8.00 |
|---|---|
| Summarize a 50-page PDF30,000 tokens in, 1,000 out | $0.07 |
| One coding-agent task60,000 tokens in, 4,000 out, no caching | $0.16 |
Checked October 26, 2026. Official pricing · Status page
Latest from Anthropic
- Anthropic status: elevated errors for Claude Sonnet 5.5 and other modelsOct 25 · Official incident
- Anthropic status: elevated errors for Claude Fable 5.1Oct 25 · Official incident
- Anthropic status: elevated errors for Claude Fable 5.1, Sonnet 5.5 and Haiku 5.5Oct 24 · Official incident
- Anthropic status: elevated errors for Claude Opus 5.5Oct 24 · Official incident
- Anthropic status: elevated errors for Claude Fable 5 and Fable 5.1Oct 24 · Official incident
All news → · Prices re-checked October 26, 2026.
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Claude Sonnet 5.5: common questions
How much does Claude Sonnet 5.5 cost?
Through the Anthropic API, Claude Sonnet 5.5 costs $2.00 per million input tokens and $10.00 per million output tokens, with cached input at $0.10. That works out to about $8.00 for 1,000 typical chat messages. Prices checked October 26, 2026. The Batch API halves both prices.
Is Claude Sonnet 5.5 dumber today?
The rating at the top of this page shows how people who used Claude Sonnet 5.5 today rate it, from Lobotomized to Big brain, and the chart shows the last 30 days next to releases and official incidents. Ratings are opinions, not a benchmark. For outages, check the Anthropic status page.
What is Claude Sonnet 5.5's context window?
Claude Sonnet 5.5 accepts up to 1M tokens of input in one request.
When was Claude Sonnet 5.5 released?
Anthropic released Claude Sonnet 5.5 on September 28, 2026. See every release and incident on the news page.
What are cheaper alternatives to Claude Sonnet 5.5?
Among mid-tier models, Gemini 3.8 Flash ($3.00 per 1,000 chats), DeepSeek V4 Pro ($3.96 per 1,000 chats) cost less for a typical chat workload. Compare everything in the cost calculator.
