Anthropic model releases

Release details

1. Sep 28, 2026Anthropic

   Claude Sonnet 5.5

   Anthropic released Claude Sonnet 5.5, the second model in the Claude 5.5 family, positioned as a faster and lower-cost complement to Opus 5.5 for everyday coding and document work. It is priced the same as Sonnet 5 at $2 per million input tokens and $10 per million output tokens and generates output more than 30% faster.

   For buildersTry Sonnet 5.5 as a faster default for well-scoped coding and document tasks, and measure cost per finished task on your own workloads to confirm the claimed token savings.

   Official announcement (opens in a new tab)↗
2. Sep 22, 2026Anthropic

   Claude Opus 5.5

   Anthropic released Claude Opus 5.5, the first model in its Claude 5.5 family, for long-running coding and knowledge work. Company pricing is $4 per million input tokens and $20 per million output tokens, with cache reads at $0.20 per million.

   For buildersRun the same long coding or knowledge-work job on Opus 5.5 and Opus 5, then compare total token cost and whether the cheaper cache-read rate actually shows up in the bill.

   Official announcement (opens in a new tab)↗
3. Sep 1, 2026Anthropic

   Claude Fable 5.1

   Anthropic introduced Fable 5.1 for coding and longer knowledge-work tasks, with availability through paid Claude plans and its developer platform.

   For buildersTry an end-to-end feature brief: ask it to inspect your app, implement the change, write checks, and explain the result.

   Official announcement (opens in a new tab)↗Read our Fable 5.1 review
4. Sep 1, 2026Anthropic

   Claude Mythos 5.1 (restricted access)

   Anthropic announced Mythos 5.1 with gains in cybersecurity and biology, retaining restricted access for vetted organizations.

   For buildersCheck eligibility and deployment conditions before planning an integration.

   Official announcement (opens in a new tab)↗Read our Fable 5.1 vs Mythos 5.1 breakdown
5. Jul 24, 2026Anthropic

   Claude Opus 5

   Opus 5 launched with improvements in coding and knowledge work, positioned below Fable in price.

   For buildersBenchmark the full workflow, including tool calls and retries, when comparing model costs.

   Official announcement (opens in a new tab)↗
6. Jun 30, 2026Anthropic

   Claude Sonnet 5

   Sonnet 5 launched with improved planning, tool use, coding, and professional work at the Sonnet price tier.

   For buildersMeasure whether a smaller model can complete the same workflow reliably before moving to a higher tier.

   Official announcement (opens in a new tab)↗
7. Jun 9, 2026Anthropic

   Claude Fable 5

   Fable 5 introduced Anthropic’s fifth generation for coding and knowledge work. Access was subsequently suspended and restored.

   For buildersFor extended agent tasks, review intermediate progress and verify claimed completion.

   Official announcement (opens in a new tab)↗Read our Claude Fable 5 guide
8. Jun 9, 2026Anthropic

   Claude Mythos 5 (restricted access)

   Mythos 5 launched for a limited set of vetted partners, with a focus on cybersecurity and scientific research.

   For buildersThis is a restricted-access research model, not a general-purpose public API choice.

   Official announcement (opens in a new tab)↗
9. May 28, 2026Anthropic

   Claude Opus 4.8

   Anthropic released Claude Opus 4.8, an update to its Opus model family with a focus on more capable coding work.

   For buildersTry it on an existing app's stubborn bug with a clear reproduction case, then review and test the proposed fix.

   Official announcement (opens in a new tab)↗See Claude plans and API pricing
10. Apr 16, 2026Anthropic

    Claude Opus 4.7

    Anthropic introduced an Opus update with stronger coding, vision, and complex multi-step task performance.

    For buildersFor visual app work, test whether the model follows both functional requirements and design references.

    Official announcement (opens in a new tab)↗
11. Feb 17, 2026Anthropic

    Claude Sonnet 4.6

    Sonnet 4.6 improved coding, computer use, and planning, with a one-million-token context window in beta.

    For buildersCompare a Sonnet-tier model with a larger model on your actual automation workload.

    Official announcement (opens in a new tab)↗See Claude plans and API pricing
12. Feb 5, 2026Anthropic

    Claude Opus 4.6

    Opus 4.6 improved coding and longer agent tasks, with a one-million-token context window in beta.

    For buildersLarge-codebase work needs checks for both retrieval accuracy and correctness of the final change.

    Official announcement (opens in a new tab)↗
13. Nov 24, 2025Anthropic

    Claude Opus 4.5

    Opus 4.5 launched with stronger coding, agent, and computer-use capabilities at a lower Opus price.

    For buildersCompare completion quality and the number of retries, not just a model’s per-token price.

    Official announcement (opens in a new tab)↗
14. Oct 15, 2025Anthropic

    Claude Haiku 4.5

    Anthropic released a new small model for coding, computer use, and responsive assistants.

    For buildersCompare task completion and response time against larger models on short coding jobs.

    Official announcement (opens in a new tab)↗See Claude plans and API pricing
15. Sep 29, 2025Anthropic

    Claude Sonnet 4.5

    Sonnet 4.5 launched with advances in coding, computer use, and complex agent workflows.

    For buildersEvaluate long-running agents on completion quality, recovery from errors, and total cost.

    Official announcement (opens in a new tab)↗
16. Aug 5, 2025Anthropic

    Claude Opus 4.1

    An Opus update improved agentic coding, reasoning, and detail tracking during research and analysis.

    For buildersMulti-file refactoring is a useful test of whether a model makes precise changes.

    Official announcement (opens in a new tab)↗
17. May 22, 2025Anthropic

    Claude Opus 4 and Sonnet 4

    Claude 4 launched with stronger coding, reasoning, and longer-running agent capabilities.

    For buildersUse repository-level tasks to evaluate whether a coding agent preserves existing behavior.

    Official announcement (opens in a new tab)↗
18. Feb 24, 2025Anthropic

    Claude 3.7 Sonnet

    Anthropic introduced a hybrid reasoning model that could respond immediately or use extended thinking.

    For buildersA single model can support both quick assistance and more deliberate technical work.

    Official announcement (opens in a new tab)↗Use Claude 3.7 Sonnet in Cursor
19. Oct 22, 2024Anthropic

    Claude 3.5 Sonnet (October update)

    An updated Sonnet model improved coding and introduced experimental computer use through the API.

    For buildersComputer-use agents need evaluation on real screen flows, including unexpected states.

    Official announcement (opens in a new tab)↗
20. Jun 20, 2024Anthropic

    Claude 3.5 Sonnet

    The first Claude 3.5 model introduced improvements in coding, visual reasoning, and speed.

    For buildersA milestone for generating interfaces and reviewing screenshots alongside code.

    Official announcement (opens in a new tab)↗
21. Mar 13, 2024Anthropic

    Claude 3 Haiku

    Haiku joined the Claude 3 family as its fast, lower-cost model.

    For buildersA useful historical example of routing straightforward requests to a smaller model.

    Official announcement (opens in a new tab)↗
22. Mar 4, 2024Anthropic

    Claude 3 Opus and Sonnet

    Opus and Sonnet launched as the first available Claude 3 models, with vision support and different capability tiers.

    For buildersCompare a larger and smaller model on the same document-understanding tasks.

    Official announcement (opens in a new tab)↗
23. Nov 21, 2023Anthropic

    Claude 2.1

    Claude 2.1 expanded context to 200K tokens and added a tool-use beta.

    For buildersLong context and external tools enable assistants grounded in a company’s documents.

    Official announcement (opens in a new tab)↗
24. Jul 11, 2023Anthropic

    Claude 2

    Claude 2 launched with improved coding, mathematics, reasoning, and longer responses, alongside a public web beta.

    For buildersLong-document assistants became a practical use case for the Claude family.

    Official announcement (opens in a new tab)↗
25. Mar 14, 2023Anthropic

    Claude and Claude Instant

    Anthropic introduced its first broadly offered Claude models, including a faster, lighter Instant version.

    For buildersAn early choice of model tiers for summarization, writing, and conversational applications.

    Official announcement (opens in a new tab)↗