Anthropic releases Claude Opus 5.5
The release of Claude Opus 5.5 from Anthropic was recorded on 22 Sep 2026. The context window is 1,000,000 tokens. The maximum output is 128,000 tokens. Pricing is $4.00 per million input tokens and $20.00 per million output tokens. 17 evidence links.
Facts as of
- Context window
- 1,000,000
- Input · USD / 1M tokens
- $4.00
- Output · USD / 1M tokens
- $20.00
- Max output
- 128,000
- Input
- text · image
- Output
- text
- Cached input · USD / 1M tokens
- $0.20
Alex's take
Evidence links 17
- Anthropic APIevidence linkdocs.anthropic.com
- Vertex AI · Model Gardenevidence linkconsole.cloud.google.com
- Anthropicevidence linkanthropic.com
- Anthropic · deprecationsevidence linkplatform.claude.com
- OpenRouterevidence linkopenrouter.ai
- OpenRouterevidence linkopenrouter.ai
- Claude Code · model idsevidence linknpmjs.com
- Vercel AI Gatewayevidence linkvercel.com
- Command Code · modelsevidence linkcommandcode.ai
- OpenCode Zen · modelsevidence linkopencode.ai
- Claude Docsevidence linkplatform.claude.com
- DesignArena · websiteevidence linkdesignarena.ai
- OpenCode · discoveryevidence linkopencode.ai
- DesignArena · uicomponentevidence linkdesignarena.ai
- Artificial Analysis · benchmarksevidence linkartificialanalysis.ai
- models.dev · catalogueevidence linkmodels.dev
- models.dev · catalogueevidence linkmodels.dev
Related signals
AnthropicSightingClaude Haiku 5.5 (Max, Default Fallback) enters at 43.4 on the Intelligence Index
Confirmed20 evidence links