Anthropic
claude-sonnet-5-5· Verified November 12, 2026Claude Sonnet 5.5 pricing and benchmarks
Anthropic’s fast mid-tier model, successor to Claude Sonnet 5 at the same price.
Input
$2.00
per 1M tokens
Cached input
$0.20
per 1M tokens
Output
$10.00
per 1M tokens
Capability index
164.4
#6 of 25 tracked
How capable is Claude Sonnet 5.5?
Claude Sonnet 5.5 scores 164.4 on the Epoch Capabilities Index (confidence interval 161.3–168.3), ranking #6 of the 25 rated models we track.
| Benchmark | Tests | Score |
|---|---|---|
| GPQA Diamond | Science reasoning | 95.6% |
| FrontierMath (Tiers 1–3) | Advanced math | 88.8% |
| SimpleQA Verified | Factual accuracy | 46.5% |
| ARC-AGI-2 | Abstract reasoning | — |
| DeepSWE | Coding | — |
| APEX-Agents | Agentic work | 75.5% |
Source: Epoch AI (as “Claude Sonnet 5.5”), best recorded result, CC BY 4.0. A dash means no published score. Compare all models
What Claude Sonnet 5.5 costs in practice
| Workload | Monthly cost |
|---|---|
Support chatbot 100,000 replies a month, ~1,500 input tokens (system prompt + history) and ~400 output tokens each. | $700.00 |
Document Q&A (RAG) 50,000 questions a month with ~8,000 tokens of retrieved context and ~600 output tokens each. | $1,100 |
Coding agent 10,000 agent steps a month, ~40,000 input tokens each (70% read from the prompt cache) and ~2,000 output tokens. | $496.00 |
Cached chatbot The same 100,000-reply support chatbot, but 60% of each prompt (system prompt + conversation history) is served from the prompt cache. | $538.00 |
Meeting notes 10,000 meetings a month summarized from ~12,000-token transcripts, ~1,000 output tokens each. | $340.00 |
Bulk translation 200,000 short translations a month, ~800 input and ~800 output tokens each. | $1,920 |
Content moderation 1,000,000 classifications a month, ~400 input tokens and ~80 output tokens each. | $1,600 |
Article drafting 300 long-form articles a month written from a ~4,000-token brief and outline, ~5,000 output tokens each. | $17.40 |
Code review bot 30,000 pull-request reviews a month, ~5,000 input tokens each (30% cached repository context) and ~700 output tokens. | $429.00 |
Invoice extraction 100,000 documents a month parsed into structured JSON, ~1,200 input and ~250 output tokens each. | $490.00 |
Pricing details
- Cache writes cost $2.50 (5-minute cache) or $4 (1-hour cache) per 1M tokens.
- US-only inference (inference_geo: "us") costs 1.1x.
Interactive Estimator
Estimate your Claude Sonnet 5.5 bill
- Claude Sonnet 5.5Anthropic$1,100/mo$0.02 / req
Standard-tier list prices. Long-context rates apply automatically where the provider publishes a threshold. Excludes cache-write surcharges, taxes, batch and volume discounts.
Claude Sonnet 5.5 pricing FAQs
- When was Claude Sonnet 5.5 released?
- Anthropic released Claude Sonnet 5.5 on September 28, 2026. Its API ID is claude-sonnet-5-5, at $2.00 input / $10.00 output per 1M tokens.
- How much does Claude Sonnet 5.5 cost per 1M tokens?
- Claude Sonnet 5.5 costs $2.00 per 1M input tokens and $10.00 per 1M output tokens, and $0.20 per 1M cached input tokens on Anthropic’s standard tier.. Cached input tokens cost $0.20 per 1M.
- What is Claude Sonnet 5.5’s context window?
- You can prompt Claude Sonnet 5.5 with up to 1M tokens. It can generate up to 128K tokens per response.
- Does Claude Sonnet 5.5 have a batch API discount?
- Yes. Asynchronous batch jobs cost 50% less: $1.00 input / $5.00 per 1M tokens.
- How does Claude Sonnet 5.5’s price compare with other AI models?
- Sorted by blended price (3 input : 1 output), Claude Sonnet 5.5 is #18 of the 29 models we track, at $4.00 per 1M tokens blended.
- How capable is Claude Sonnet 5.5?
- Epoch AI rates Claude Sonnet 5.5 at 164.4 on its Capabilities Index — rank #6 of 25 rated models, with a confidence interval of 161.3–168.3.