Claude Opus 5.5 API pricing.
Claude Opus 5.5 is Anthropic’s model on the API market, released 22 Sept 2026. Prices are per million tokens in USD, as last read from the price list.
Each bar is this model's score in that area. The white tick marks the best score any model Epoch has tested reaches there.
The index combines many benchmarks into one general-capability score; the range is how sure Epoch is of the number. Each area score is this site's average of the model's Epoch results in that area, where 0 is what guessing would score and 100 is perfect. Compare every model, and value for money →
Source: Epoch AI, Capabilities & benchmarking (licensed CC BY 4.0). Data refreshed 2 November 2026. These are Epoch's own tests; other benchmark sites can rank models differently.
- GPT-6.1 Terra · OpenAIindex 168.11 · 75% cheaper
- GPT-6.1 Sol · OpenAIindex 167.82 (1 below) · 50% cheaper
- Claude Sonnet 5.5 · Anthropicindex 166.74 (2 below) · 50% cheaper
- Gemini 4 Argon · Google DeepMindindex 166.07 (2 below) · 50% cheaper
Models within 5 points of Claude Opus 5.5 on Epoch's Capabilities Index that cost less, comparing a typical chat mix (three parts input to one part output). A few points of index is a small difference and says nothing about your task: a place to start testing, not a verdict. Capability against price for every model.
- Provider
- Anthropic
- Model id
anthropic/claude-opus-5.5- Input
- $4.00
- Output
- $20
- Cached input
- $0.20
- Context window
- 1M tokens
- Maximum output
- 128K tokens
- Takes
- text, image, file
- Returns
- text
- Tool use
- Yes
- Reasoning
- Yes
- Released
- 22 Sept 2026
- First tracked
- 22 Sept 2026
At $4.00 per million input tokens, Claude Opus 5.5 is dearer than 311 of the 340 models on the price list.
No price change has been recorded since tracking began on 17 Sept 2026. Prices are checked every six hours, and any change is listed here and on model changes.
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- The Decoder ·Chinese AI model Kimi K3.1 Pro is closing in on Anthropic's Claude Opus 5.5
- Google Cloud AI & Machine Learning ·Claude Opus 5.5 and Claude Sonnet 5.5 are now available in Google Antigravity
- Tom's Guide AI ·ChatGPT-6 or Claude Opus 5.5? Here’s which AI I'd use for writing, planning and 5 other everyday tasks
- Tom's Guide AI ·I tested ChatGPT-6 vs Claude Opus 5.5 with 5 everyday prompts — it wasn’t even close
- Latent Space ·[AINews] Claude Opus 5.5, the new default model for AINews — and everybody cuts prices 40-50%
- Simon Willison's Weblog ·Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war
- Claude Haiku 5.5$0.10 in · $0.50 out
- Claude Haiku 4.5$1.00 in · $5.00 out
- Claude Sonnet 5.5$2.00 in · $10 out
- Claude Sonnet 5$2.00 in · $10 out
- Claude Sonnet 4.6$3.00 in · $15 out
- Claude Sonnet 4.5$3.00 in · $15 out
- Claude Opus 5$5.00 in · $25 out
- Claude Opus 4.8$5.00 in · $25 out
Prices and specifications come from OpenRouter’s catalogue, last read 2 Nov 2026. A provider’s own price may differ; how this is collected.