Anthropic
San Francisco, United States · founded 2021 · Claude models
SI safety and research company, organised as a public benefit corporation, that builds the Claude models. Its lineup runs Fable, Opus, Sonnet and Haiku from most to least capable.
- Tracked models
- 4
- 0 with open weights
- Benchmarks led
- 15
- Intelligence Index, Terminal-Bench 4.0, SciCode…
- Latest release
- Oct 7
- Claude Haiku 5.5
- Cheapest
- $0.20
- Claude Haiku 5.5, blended per 1M
Current lineup
4 models, strongest first.
Claude Opus 5.5
FlagshipReleased
The model Anthropic tells most developers to start with: built for long autonomous coding sessions and document-heavy professional work. It lands close to — and on many benchmarks above — the pricier Fable 5.1 at 40% of the per-token price.
- Index
- 57.6
- In / 1M
- $4
- Out / 1M
- $20
- Context
- 1M
Claude Sonnet 5.5
Mid-tierReleased
The faster, cheaper companion to Opus 5.5 for well-scoped everyday coding, bug fixing and producing documents, slides and spreadsheets. At maximum effort it approaches Opus on several benchmarks; Anthropic says Opus stays ahead on open-ended work that needs sustained judgement.
- Index
- 56.0
- In / 1M
- $2
- Out / 1M
- $10
- Context
- 1M
Claude Fable 5.1
FlagshipReleased
Anthropic's top publicly available tier, sitting above Opus and aimed at the hardest reasoning problems and agent runs that last for hours. Anthropic itself suggests starting on Opus 5.5 and moving up only when that falls short — and the newer Opus now outscores it on most benchmarks.
- Index
- 53.4
- In / 1M
- $10
- Out / 1M
- $50
- Context
- 1M
Claude Haiku 5.5
Small & fastReleased
Small, fast model for high-volume and latency-sensitive jobs such as classification, extraction, routing, summarising and sub-agent work. It is the first Haiku with adjustable reasoning effort and a 1M-token context.
- Index
- 43.4
- In / 1M
- $0.10
- Out / 1M
- $0.50
- Context
- 1M