Claude Sonnet 5.5: Benchmarks, Pricing & Context Window
Claude Sonnet 5.5 is a language model from Anthropic, released in September 2026, with multimodal input, a 1M-token context window, and pricing from $2.00/M input, $0.200/M cached input, $10.00/M output.
Claude Sonnet 5.5 is Anthropic’s September 2026 model for everyday agentic coding, document creation, and knowledge work. It supports text and image input, text output, a 1M-token context window, and 128K output tokens. Adaptive thinking
Claude Sonnet 5.5 benchmarks
Capability tiers
Standing within each category, adjusted for leaderboard depth.
Real tasks performance
High-confidence performance for Claude Sonnet 5.5 across real-world prompt categories. Only 95% intervals at most 4 points wide are shown.
Performance by conversation depth
How Claude Sonnet 5.5 holds up as conversations get longer.
Quality Tracker
Claude Sonnet 5.5 Performance Across Datasets
Scores sourced from the model's scorecard, paper, or official blog posts
llm-stats.com - Mon Sep 28 2026Claude Sonnet 5.5 pricing
Providers
Claude Sonnet 5.5 starts at $2.00 per million input tokens and $10.00 per million output tokens via Anthropic. Reused prompt prefixes cost $0.200 per million cached input tokens.
| Provider | Input $/M | Cached input $/M | Output $/M | Context in / out | TTFT p95 s | Output p5 c/s | Modalities in / out |
|---|---|---|---|---|---|---|---|
 Anthropic | $2.00 | $0.200 | $10.00 | 1.0M/128.0K | 0.40 | — | / |
Cached input is the discounted price for prompt tokens served from a provider cache. TTFT is time to first token. Output is characters per second; p5 is the sustained floor exceeded by 95% of observed requests.
Claude Sonnet 5.5 context window
Input and output token limits for Claude Sonnet 5.5, plus how it ranks on long-context understanding.
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Claude Sonnet 5.5 latency
Claude Sonnet 5.5 time to first token, sustained output throughput, and failed-request rate from live model usage over the trailing 7 days.
Claude Sonnet 5.5 examples
Recent arena outputs from Claude Sonnet 5.5, picked from the highest-ranked matchups.
Claude Sonnet 5.5 license
Claude Sonnet 5.5 is a proprietary model available under its provider's product and API terms, has a knowledge cutoff of June 2026.
- License
- Proprietary
- Hosted access
- Knowledge cutoff
- June 2026
Proprietary license - usage restrictions apply
Claude Sonnet 5.5 resources
Official sources for Claude Sonnet 5.5: provider documentation, official playground, paper or system card, official launch post.
Claude Sonnet 5.5 vs other models
The most-compared alternatives to Claude Sonnet 5.5 are GPT-6 Astra, Claude Opus 5.5, GPT-5.6 Sol. Open any pair side-by-side for benchmarks, pricing, context, and latency.
Models like Claude Sonnet 5.5
Models ranked just above and below Claude Sonnet 5.5 by LLM Stats score.
FAQ
Common questions about Claude Sonnet 5.5.