Anthropic · Claude Opus version history

Dates refer to release events, not our crawl or news publication times. Announcement, preview and availability can happen on different days. This is a curated record, not an exhaustive catalogue or a guarantee of the latest version.

Company All companiesAnthropicOpenAIGoogleMetaxAIMistralNVIDIADeepSeekQwenKimi / MoonshotZ.aiMiniMaxByteDance Seed Company

Named Opus releases and distinct announcements checked against official launch and API release notes through October 1, 2026. Numerical gaps are not filled. Availability describes launch-day access, not current support; older models may be retired.
Sources checked through 2026-10-01

Product Claude OpusClaude SonnetClaude Haiku

Direction: oldest → newest · Earliest documented event · Most recent documented event

1. 2024-03-04

   Claude Opus 3

   Release (see availability)

   First Opus in the multimodal Claude 3 family.

   Claude API and Claude Pro; partner clouds forthcoming.

   Official sources

   • Anthropic: Claude Opus 3

   Link to this event
2. 2025-05-22

   Claude Opus 4

   Release (see availability)

   Extended thinking and sustained coding and agent workflows.

   Paid Claude plans, API, Bedrock and Vertex AI.

   Official sources

   • Anthropic: Claude Opus 4

   Link to this event
3. 2025-08-05

   Claude Opus 4.1

   Release (see availability)

   Improved coding, reasoning and agentic tasks.

   Paid Claude, Claude Code, API and partner clouds.

   Official sources

   • Anthropic: Claude Opus 4.1

   Link to this event
4. 2025-11-24

   Claude Opus 4.5

   Release (see availability)

   Improved coding, agents and computer use at lower token prices.

   Claude apps, API and three major clouds.

   Official sources

   • Anthropic: Claude Opus 4.5

   Link to this event
5. 2026-02-05

   Claude Opus 4.6

   Release (see availability)

   Improved sustained agent coding; 1M-token context initially in beta.

   Model publicly released; beta applied to context capability.

   Official sources

   • Anthropic: Claude Opus 4.6

   Link to this event
6. 2026-04-16

   Claude Opus 4.7

   Release (see availability)

   Improved difficult coding and high-resolution image understanding.

   Generally available in Claude, API, Bedrock, Vertex AI and Microsoft Foundry.

   Official sources

   • Anthropic: Claude Opus 4.7

   Link to this event
7. 2026-05-28

   Claude Opus 4.8

   Release (see availability)

   More reliable agentic work and collaboration.

   Available across platforms; fast mode remained a research preview.

   Official sources

   • Anthropic: Claude Opus 4.8

   Link to this event
8. 2026-07-24

   Claude Opus 5

   Release (see availability)

   Improved coding and knowledge work for long-running agents.

   All platforms including API; default on Claude Max at launch.

   Official sources

   • Anthropic: Claude Opus 5

   Link to this event
9. 2026-09-22

   Claude Opus 5.5

   Release (see availability)

   Improved complex coding and knowledge work with faster, more efficient output.

   All platforms including API, AWS, Google Cloud and Azure.

   Official sources

   • Anthropic: Claude Opus 5.5

   Link to this event

Related news

Recent collected reports; these dates describe our news records, not release milestones. Coverage is bounded to recent public reports.

• 2026-10-04Anthropic's Claude Opus 5 achieved a 100% score across 20 structured accounting benchmark attempts, outperforming human accountants in a Mercor study.
• 2026-10-01Anthropic · Claude Sonnet 5.5 · Access / plan report · Claude Sonnet 5.5 est disponible dans l’offre gratuite, contrairement à Opus 5.5. - NotebookCheck.biz News
• 2026-09-30Anthropic · Claude Sonnet 5.5 · Performance / cost report · Claude Sonnet 5.5 est là : presque aussi puissant qu'Opus 5.5, pour moitié moins cher - Les Numériques
• 2026-09-29Anthropic · Claude Sonnet · Comparison / evaluation · Le nouveau Claude Sonnet 5.5 d'Anthropic bat Opus 5.5 sur un test de code, pour deux fois moins cher
• 2026-09-29Anthropic · Claude Sonnet 5.5 · Performance / cost report · Anthropic's Claude Sonnet 5.5 Is Out, Beats Opus 5.5 at Coding for Half the Price - Decrypt
• 2026-09-29Anthropic · Claude Sonnet 5.5 · Migration guide · Claude Sonnet 5.5 is out! We wrote a guide for building with it: • choosing between Sonnet 5.5 and Opus 5.5 • migrating from Sonnet 5 and tuning effort • using it in Claude Code https://t.co/YAQBD95pF8 https://t.co/exQKLA9rev
• 2026-09-29Anthropic · Claude Sonnet 5.5 · Performance / cost report · Anthropic's Claude Sonnet 5.5 Is Out, Beats Opus 5.5 at Coding for Half the Price
• 2026-09-29Anthropic · Claude Sonnet · Comparison / evaluation · Anthropic has launched Claude Sonnet 5.5: it scores 56 on the Artificial Analysis Intelligence Index, just 2 points behind Opus 5.5 (max), but at the highest Output Tokens per Task we’ve seen With max effort, Sonnet 5.5 gains 18 points over Sonnet 5 and to #2 on the Intelligence Index behind only Opus 5.5 (max). Anthropic has priced Sonnet 5.5 identically to Sonnet 5 at $0.2/$2/$10 per 1M cache input/input/output tokens, however it outputs a higher number of Output Tokens per Task and costs $7.6