Claude Sonnet 5.5: specs, pricing and how it performs in a council

Claude Sonnet 5.5 is Anthropic's model available on Council AI at $2.00 per million input tokens and $10.00 per million output, with a 1,000,000-token context window. Anthropic's Sonnet 5.5 (released Sep 28, 2026). Direct upgrade to Sonnet 5 at the same $2/$10, strongest at building features, fixing bugs and everyday professional work. 1M context. No sampling params. On Council you do not run it alone: the same prompt goes to up to 10 models from different labs in parallel, and a moderator synthesizes one answer with a consensus score showing where the labs agreed.

Claude Sonnet 5.5 specifications

What Claude Sonnet 5.5 is good at

Anthropic's Sonnet 5.5 (released Sep 28, 2026). Direct upgrade to Sonnet 5 at the same $2/$10, strongest at building features, fixing bugs and everyday professional work. 1M context. No sampling params.

Council surfaces it for: coding, agents, general, balanced.

It has native web search, so it can ground answers in current sources rather than training data alone.

Claude Sonnet 5.5 pricing on Council AI

Council does not resell tokens. Every paid plan carries a monthly budget and each model draws against it at cost: $2.00 in / $10.00 out per million tokens for Claude Sonnet 5.5. Plans start at $19.99/mo (Plus), $39.99/mo (Pro) and $99.99/mo (Ultra, which adds media review, the personal RAG library and MCP server).

If budget is the binding constraint, GLM-5.3 is the cheaper seat in the lineup at $1.40/$4.80.

Using Claude Sonnet 5.5 in a council

A single model — this one included — can be confidently wrong. Council runs Claude Sonnet 5.5 alongside models from other labs on the same prompt, then scores how much they agreed. High consensus is a signal you can act on the answer; low consensus surfaces the specific point they split on, which is usually the part worth checking yourself.

Other Anthropic models in the lineup: Claude Fable 5.1, Claude Opus 5.5, Claude Haiku 5.5.

Frequently asked questions