Claude Sonnet 5.5
The value pick of the table: second on the index at a fifth of the Opus price, and the fastest of the top five.
Key facts
- Score
- 84 / 100, rank #4
- Price
- $2 in · $10 out per 1M tokens (Claude pricing)
- Blended price
- $4 per 1M tokens (3 input : 1 output)
- Context window
- 1M
- Open weights
- No
- Best for
- Production coding assistants, High-volume agents, Default model for most teams
Claude Sonnet 5.5 costs $2 per million input tokens and $10 per million output tokens on Anthropic's list price (Claude pricing, read Oct 10, 2026).
Independent evals
| Benchmark | Result | Who ran it | Read |
|---|---|---|---|
| Artificial Analysis Intelligence Index (max) | 56 | Artificial Analysis LLM leaderboard | Oct 9, 2026 |
- Artificial Analysis output speed (max): 141 tokens/s (Artificial Analysis LLM leaderboard)
What practitioners say
Less discussed than its siblings because it just works; the October cache-read price cut to $0.10 per million was the news.
Questions people ask
How much does Claude Sonnet 5.5 cost?
Claude Sonnet 5.5 costs $2 per million input tokens and $10 per million output tokens on Anthropic's list price (Claude pricing, read Oct 10, 2026).
How good is Claude Sonnet 5.5?
Claude Sonnet 5.5 ranks #4 of 12 on the Models at Work leaderboard with a score of 84 out of 100 (October 2026 edition). The value pick of the table: second on the index at a fifth of the Opus price, and the fastest of the top five.
What is Claude Sonnet 5.5 best for?
Claude Sonnet 5.5 is best for production coding assistants, high-volume agents, default model for most teams.
What are Claude Sonnet 5.5's benchmark scores?
Artificial Analysis Intelligence Index (max): 56 (Artificial Analysis LLM leaderboard).
What is Claude Sonnet 5.5's context window?
Claude Sonnet 5.5 has a 1M token context window according to Anthropic.
Is Claude Sonnet 5.5 open weights?
No. Claude Sonnet 5.5 is a proprietary model available through Anthropic's API and partner clouds.
Compare Claude Sonnet 5.5
- Claude Sonnet 5.5 vs Claude Opus 5.5
- Claude Sonnet 5.5 vs GPT-6 Astra
- Claude Sonnet 5.5 vs Gemini 4 Argon
- Claude Sonnet 5.5 vs GPT-6.1 Sol
- Claude Sonnet 5.5 vs Claude Fable 5.1
- Claude Sonnet 5.5 vs Claude Haiku 5.5
- Claude Sonnet 5.5 vs Muse Spark 1.3
- Claude Sonnet 5.5 vs DeepSeek Flash (4.1)
- Claude Sonnet 5.5 vs GPT-6 Luna
- Claude Sonnet 5.5 vs Kimi K3
- Claude Sonnet 5.5 vs Grok 4.7
Methodology: Score is 0 to 100: 50% independent evals normalised within this table, 20% price-performance, 15% practitioner sentiment from Signals and community threads, 15% operational fit (context, speed, availability, open weights). Models within three points are a tie in practice. Vendor-published figures are labelled as such and never counted as independent. Our coverage: read the article.