flagshipAnthropic·Released 2026-09
Claude Opus 5.5
Anthropic's current Opus model, built for long-running agentic coding and knowledge work. Anthropic suggests it as the starting point for most workloads.
Pricing verified October 20, 2026 · source
Key specifications
| Vendor | Anthropic |
| Tier | flagship |
| Context window | 1M tokens |
| Pricing | $4 / $20 per 1M tokens (input/output) |
| Released | 2026-09 |
| Categories | Text GenerationAdvanced ReasoningCode GenerationMultimodalEnterprise |
Note: Verified 2026-10-20: model page shows Status "Active (latest)", released September 22, 2026, $4 / $20 per MTok, 1M context, 128K max output, retirement not sooner than September 22, 2027.
Key features
- •Current Opus model
- •Adaptive thinking (always on)
- •1M-token context window with 128K max output
- •Cache reads at $0.20 per 1M tokens
- •Available on the Claude API, Bedrock, Google Cloud, Microsoft Foundry and Claude Platform on AWS
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