Claude Sonnet 5.5 API Pricing
Anthropic · released 2026-09-28
Also searched as: Sonnet 5.5 pricing
Claude Sonnet 5.5 price
0.200¢ / 1K
1.00¢ / 1K
0.400¢ / 1K
Official list price from Anthropic, as recorded by models.dev
What it actually costs
| Workload | Tokens | Cost |
|---|---|---|
| Short chat reply | 500 in / 300 out | 0.4¢ |
| RAG query | 4,000 in / 500 out | $0.0130 |
| Long document summary | 50,000 in / 1,000 out | $0.1100 |
| Code review of a 2k-line file | 30,000 in / 2,000 out | $0.0800 |
| 1,000 chat replies/day for 30 days | 30,000 × (500 in / 300 out) | $120.00 |
Cost = (input tokens ÷ 1,000,000 × $2.00) + (output tokens ÷ 1,000,000 × $10.00).
Benchmarks
| Benchmark | Value | Source | As of |
|---|---|---|---|
| Epoch Capabilities Index (ECI) | 166.6 | epoch | 2026-09-28 |
| Epoch Mock AIME accuracy | 100.0% | epoch | 2026-09-28 |
| Epoch FrontierMath (T1–3) accuracy | 88.8% | epoch | 2026-09-28 |
| Arena text rating | 1473 | arena | 2026-11-11 |
| Arena coding rating (human preference votes, not task accuracy) | 1517 | arena | 2026-11-11 |
| Arena math rating | 1486 | arena | 2026-11-11 |
| Arena WebDev rating | 1772 | arena | 2026-11-11 |
LiveBench
Shown on this model page only — LiveBench data never appears in any leaderboard, comparison table or structured data on this site.
| LiveBench metric | Value | As of |
|---|---|---|
| LiveBench Global Average | 77.8 | 2026-06-25 |
| LiveBench Reasoning | 91.6 | 2026-06-25 |
| LiveBench Coding | 91.4 | 2026-06-25 |
| LiveBench Agentic Coding | 56.3 | 2026-06-25 |
| LiveBench Mathematics | 96.7 | 2026-06-25 |
| LiveBench Data Analysis | 78.6 | 2026-06-25 |
| LiveBench Language | 83.4 | 2026-06-25 |
| LiveBench Instruction Following | 70.5 | 2026-06-25 |
LiveBench leaderboard (livebench.ai, github.com/LiveBench/new-livebench), CC BY-SA 4.0 — livebench.ai · github.com/LiveBench/new-livebench · CC BY-SA 4.0
Similar ECI, lower price
| Model | ECI | Blended $/1M |
|---|---|---|
| GPT-6.1 Terra | 167.7 | $2.00 |
More from Anthropic
| Model | Released | Blended $/1M |
|---|---|---|
| Claude Fable 5.2 | 2026-11-09 | $16.00 |
| Claude Haiku 5.5 | 2026-10-07 | $0.20 |
| Claude Opus 5.5 | 2026-09-22 | $8.00 |
| Claude Mythos 5.1 | 2026-09-01 | $20.00 |
| Claude Fable 5.1 | 2026-09-01 | $20.00 |
| Claude Opus 5 | 2026-07-24 | $10.00 |
| Claude Sonnet 5 | 2026-06-30 | $4.00 |
| Claude Mythos 5 | 2026-06-09 | $20.00 |
Count tokens & estimate cost for Claude Sonnet 5.5 See Claude Sonnet 5.5 on the leaderboard
Prices: Anthropic's official list price as recorded by models.dev; benchmarks: see sources below; last synced 2026-11-13.
FAQ
Who develops Claude Sonnet 5.5?
Claude Sonnet 5.5 is developed by Anthropic, released 2026-09-28.
How much does Claude Sonnet 5.5 cost per million tokens?
Claude Sonnet 5.5 costs $2.00 per 1M input tokens and $10.00 per 1M output tokens ($4.00 blended), per Anthropic's official list price as recorded by models.dev.
What is the Claude Sonnet 5.5 API price?
The Claude Sonnet 5.5 API price is $2.00 per 1M input tokens and $10.00 per 1M output tokens ($4.00 per 1M blended).
How much does Claude Sonnet 5.5 cost for a typical request?
A short chat reply (500 in / 300 out tokens) costs about 0.4¢ on Claude Sonnet 5.5, at $2.00/1M input and $10.00/1M output.
Is Claude Sonnet 5.5 free?
Claude Sonnet 5.5's official API list price is $2.00 per 1M input tokens and $10.00 per 1M output tokens. This site tracks list prices only, not free tiers or trial credits — check Anthropic's site for those.
How does Claude Sonnet 5.5 rank on benchmarks?
Claude Sonnet 5.5 scores 166.6 on the Epoch Capabilities Index (ECI), ranking #8 of 110 models we track with a published ECI score.
Is there a cheaper model with a similar ECI to Claude Sonnet 5.5?
Yes — GPT-6.1 Terra scores a similar ECI (167.7) at $2.00/1M blended, versus $4.00/1M for Claude Sonnet 5.5.
Where does this data come from?
Pricing for Claude Sonnet 5.5 comes from models.dev and LiteLLM (open MIT-licensed catalogs); benchmark scores come from Epoch AI and LMArena (open CC BY 4.0 licenses); LiveBench scores (below) are CC BY-SA 4.0 — see /data-sources/. Last synced 2026-11-13.