News
Anthropic Ships Claude Opus 5.5: $4/$20 Pricing Lowers the Flagship Bar
Anthropic has released Opus 5.5 (claude-opus-5-5), the first model of the Claude 5.5 family: $4/$20 per million tokens — 20% below Opus 5 — with a 1M-token context window. Anthropic claims Fable 5.1-level results on most work at under half the price. Sonnet 5.5 followed six days later.
Source: BenchLM（Claude API Pricing 汇总）
Launch
On September 22, 2026, Anthropic released Claude Opus 5.5 (API model ID: claude-opus-5-5), the first model of the Claude 5.5 family, replacing Opus 5. Claude Sonnet 5.5 followed on September 28. Notably, OpenAI announced GPT-6 Sol / Luna within about an hour of Anthropic's announcement — the flagship price war is unmistakable.
Pricing (per million tokens)
- Input $4.00 / output $20.00 — 20% below Opus 5 ($5/$25)
- Cache reads $0.20 (60% lower than Opus 5)
- Batch API at half price ($2.00/$10.00); Fast mode $8.00/$40.00 (up to 2.5× output speed)
- Anthropic claims typical workloads run about 40% cheaper overall (faster output, fewer tokens per task)
Specs and Capabilities
- 1M-token context window, 128K max output (up to 300K via Batch API beta)
- Adaptive thinking is always on and cannot be disabled; default effort moved from high to medium
- Positioning: Claude Fable 5.1-level results on most work at less than half its price ($10/$50)
- Knowledge cutoff: June 2026
Availability and Compliance
- Claude API, Amazon Bedrock, Google Cloud Vertex AI, Microsoft Azure/Foundry, and Claude Pro/Max/Team plans
- Externally tested by METR and Frontier Design; ships with watermarking for EU AI Act compliance