Claude Sonnet 5.5
Claude Sonnet 5.5 by Anthropic: League Score, pricing, context window and sourced benchmarks — the full tracked record.
87 Closed $2.00 / $10.00 per 1M 1M context
League positions: #7 overall · #14 Value Division. Score coverage: 40% of components measured. Count tokens & cost for Claude Sonnet 5.5 · Estimate a workload cost
Agent-ready: this model is tracked with agentic strengths. See the AI Agents section for the products and frameworks that put models like this to work.
Specifications & pricing
| Maker | Anthropic — lab profile |
| Family | Claude Sonnet |
| Released | Sep 28, 2026 |
| Status | Current |
| Weights | Closed / proprietary API |
| License | Proprietary |
| Knowledge cutoff | 2026-06 |
| Context window | 1,000,000 tokens |
| Max output | 128,000 tokens |
| Modalities in | text, image |
| Modalities out | text |
| API price (input) | $2.00 per 1M tokens |
| API price (output) | $10.00 per 1M tokens |
| Cached input | $0.10 per 1M |
| Blended (3:1 in:out) | $4.00 per 1M |
| Pricing source | Official pricing page (checked Oct 14, 2026) |
| API access | Anthropic API |
Benchmark results
| Benchmark | Score | Source | Date | Link |
|---|---|---|---|---|
| LiveBench overall | 82.5 / 100 | LiveBench | Oct 14, 2026 | Source |
How its League Score is built
| Component | Raw | Normalised | Weight | Date | Link |
|---|---|---|---|---|---|
| LiveBench overall | 82.5 | 86.9 | 40% | Oct 14, 2026 | Source |
Normalised 0–100 against the tracked field; missing components redistribute their weight. Full rules on the methodology page.
Closest rivals
- Claude Sonnet 5.5 vs Gemini 4 Argon — full comparison or compare any pair
- Claude Sonnet 5.5 vs GPT-5.6 Sol — full comparison or compare any pair
- Claude Sonnet 5.5 vs Claude Opus 5 — full comparison or compare any pair
FAQ
How much does Claude Sonnet 5.5 cost?
Claude Sonnet 5.5 costs $2.00 per 1M input tokens and $10.00 per 1M output tokens on the first-party API (checked Oct 14, 2026).
What is the context window of Claude Sonnet 5.5?
Claude Sonnet 5.5 accepts up to 1,000,000 tokens of context.
Is Claude Sonnet 5.5 open source?
No — Claude Sonnet 5.5 is a closed model available through Anthropic’s API and products.
Data verified Oct 14, 2026. Spotted an error? Every figure above links to its source.