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Claude Opus 4.6
Anthropic · Opus
Anthropic released Claude Opus 4.6 on February 5, 2026.
Claude Opus 4.6 is the Anthropic model launched on February 5, 2026 for coding, financial analysis, research, documents, spreadsheets and presentations, and long-running agentic work in tools like Claude Code and Cowork. It was the first Opus-class model with a 1M token context window (in beta on the Claude Developer Platform) and supports up to 128k output tokens. Standard pricing stayed at $5 / $25 per million input / output tokens, with premium pricing for prompts over 200k tokens. It launched with adaptive thinking, four effort levels (low, medium, high and max), context compaction in beta and US-only inference. Fast mode followed in research preview a few days later.
Claude Opus 4.6 at a glance
- Released
- API model id
claude-opus-4-6- Available on
- claude.aiClaude API
- Previous model
- Claude Opus 4.5 (November 24, 2025)
- Announcement
- anthropic.com
What changed from Claude Opus 4.5
Anthropic said Opus 4.6 plans more carefully, sustains agentic tasks for longer, works more reliably in larger codebases and catches more of its own mistakes in code review and debugging.
On GDPval-AA it scored about 190 Elo points above Claude Opus 4.5, and on the 8-needle 1M variant of MRCR v2 it scored 76%. Adaptive thinking replaced manual thinking budgets as the recommended mode, and prefilling assistant messages is not supported.
New to model names and version numbers? Read how AI labs version their models.
Claude Opus 4.6 release timeline
The launch and every later Anthropic release that mentions Claude Opus 4.6, oldest first.
- Claude Opus 4.6 Release
Introducing Claude Opus 4.6 with improved coding skills, longer agentic task support, 1M token context window, and enhanced performance in financial analysis, research, and document creation.
Source: Anthropic - Claude for Excel improvements
Claude for Excel was updated to use Opus 4.6 and to support native spreadsheet actions like pivot table editing and conditional formatting.
Source: Claude Help Center Release Notes - Fast Mode for Opus 4.6
Launched fast mode in research preview for Opus 4.6, providing 2.5x faster output token generation through speed parameter. Available at premium pricing with waitlist access.
Source: Claude Platform Release Notes - Partnering with Mozilla to improve Firefox’s security
Collaboration with Mozilla to identify 22 vulnerabilities in Firefox using Claude Opus 4.6, including 14 high-severity issues.
Source: Anthropic - 1M Token Context Window Launch
1M token context window launched for Claude Opus 4.6 and Sonnet 4.6 at standard pricing. Requests over 200k tokens work automatically without beta headers. Media limit increased to 600 images/PDFs per request with 1M context window.
Source: Claude Platform Release Notes - Message Batches API Max Tokens Increase
Raised max_tokens cap to 300k on Message Batches API for Opus 4.6/Sonnet 4.6
Source: Claude Platform Release Notes - Fast Mode Support for Claude Opus 4.7
Fast mode (research preview) now supports Claude Opus 4.7. Set speed: "fast" with model: "claude-opus-4-7" and the fast-mode-2026-02-01 beta header for significantly faster output token generation at premium pricing. Pricing, rate limits, and access are the same as for Opus 4.6…
Source: Claude Platform Release Notes - Models API adds line field for model grouping
We've added a line field to the Models API. GET /v1/models and GET /v1/models/{model_id} now return the model line each model belongs to. Claude Opus 4.5 and Claude Opus 4.6 both report opus, for example. Use line to group models without parsing their IDs. line is null for a mod…
Source: Claude Platform Release Notes
Claude Opus 4.6 FAQ
When was Claude Opus 4.6 released?
Anthropic released Claude Opus 4.6 on February 5, 2026. The launch entry below links to the official announcement.
Where is Claude Opus 4.6 available?
Claude Opus 4.6 is available on claude.ai and Claude API. Later availability changes are listed under follow-up releases on this page.
What is the Claude Opus 4.6 API model id?
Use claude-opus-4-6 in Anthropic's API.
What came before Claude Opus 4.6?
Claude Opus 4.6 follows Claude Opus 4.5, released on November 24, 2025.
Other Anthropic models
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