Anthropic
Claude Sonnet 5.5 Pricing, Specs & Alternatives
Anthropic says it runs 30 percent faster than Sonnet 5. Released Sep 28, 2026.
Latest changes
All changesGet an email when Claude Sonnet 5.5 changes its price or plans
Questions
How much does Claude Sonnet 5.5 cost
Claude Sonnet 5.5 lists $2 per 1M input tokens and $10 per 1M output tokens, checked Nov 9, 2026 on docs.anthropic.com.
When did Claude Sonnet 5.5 last change its price
Oct 7, 2026: Claude Sonnet 5.5 cache reads cut 50 percent to $0.10 per 1M.
When was Claude Sonnet 5.5 released
Sep 28, 2026, per platform.claude.com.
What is the Claude Sonnet 5.5 context window
1M tokens, per platform.claude.com, read Nov 9, 2026.
Who makes Claude Sonnet 5.5
Anthropic.
What are alternatives to Claude Sonnet 5.5
DeepSeek V4 Pro, Gemini 3.1 Pro Preview, Gemini 3.6 Flash, Gemini 3.8 Flash, GPT-5.6 Terra.
Head to head
All comparisons- Claude Sonnet 5.5 vs GPT-6.1 Sol: Claude Sonnet 5.5 $2 / $10 vs GPT-6.1 Sol $2 / $10 per 1M tokens in / out.
- Claude Sonnet 5.5 vs Gemini 3.1 Pro Preview: Claude Sonnet 5.5 $2 / $10 vs Gemini 3.1 Pro Preview $2 / $12 per 1M tokens in / out.
- Claude Sonnet 5.5 vs GPT-5.6 Terra: Claude Sonnet 5.5 $2 / $10 vs GPT-5.6 Terra $2 / $12 per 1M tokens in / out.