# Anthropic — AI model releases

Anthropic has 27 AI model releases tracked on AI Release Tracker, from Mar 14 2023 through Sep 1 2026. AI safety company building the Claude family of models. Founded in 2021 by former OpenAI researchers.

Official site: https://www.anthropic.com

## Releases, newest first

| Model | Release date | Licensing | Context window | Page |
| --- | --- | --- | --- | --- |
| Claude Fable 5.1 | Sep 1 2026 | Proprietary | 1M | https://aireleasetracker.com/model/anthropic/claude-fable-5.1 |
| Claude Mythos 5.1 | Sep 1 2026 | Proprietary | 1M | https://aireleasetracker.com/model/anthropic/claude-mythos-5.1 |
| Claude Opus 5 | Jul 24 2026 | Proprietary | 1M | https://aireleasetracker.com/model/anthropic/claude-opus-5 |
| Claude Sonnet 5 | Jun 30 2026 | Proprietary | — | https://aireleasetracker.com/model/anthropic/claude-sonnet-5 |
| Claude Fable 5 | Jun 9 2026 | Proprietary | 1M | https://aireleasetracker.com/model/anthropic/claude-fable-5 |
| Claude Mythos 5 | Jun 9 2026 | Proprietary | 1M | https://aireleasetracker.com/model/anthropic/claude-mythos-5 |
| Claude Opus 4.8 | May 28 2026 | Proprietary | 1M | https://aireleasetracker.com/model/anthropic/claude-opus-4.8 |
| Claude Opus 4.7 | Apr 16 2026 | Proprietary | 1M | https://aireleasetracker.com/model/anthropic/claude-opus-4.7 |
| Claude Sonnet 4.6 | Feb 17 2026 | Proprietary | — | https://aireleasetracker.com/model/anthropic/claude-sonnet-4.6 |
| Claude Opus 4.6 | Feb 5 2026 | Proprietary | — | https://aireleasetracker.com/model/anthropic/claude-opus-4.6 |
| Claude Opus 4.5 | Nov 24 2025 | Proprietary | — | https://aireleasetracker.com/model/anthropic/claude-opus-4.5 |
| Claude Haiku 4.5 | Oct 15 2025 | Proprietary | — | https://aireleasetracker.com/model/anthropic/claude-haiku-4.5 |
| Claude Sonnet 4.5 | Sep 29 2025 | Proprietary | — | https://aireleasetracker.com/model/anthropic/claude-sonnet-4.5 |
| Claude Opus 4.1 | Aug 5 2025 | Proprietary | — | https://aireleasetracker.com/model/anthropic/claude-opus-4.1 |
| Claude Sonnet 4 | May 22 2025 | Proprietary | — | https://aireleasetracker.com/model/anthropic/claude-sonnet-4 |
| Claude Opus 4 | May 22 2025 | Proprietary | — | https://aireleasetracker.com/model/anthropic/claude-opus-4 |
| Claude 3.7 Sonnet | Feb 24 2025 | Proprietary | — | https://aireleasetracker.com/model/anthropic/claude-3.7-sonnet |
| Claude 3.5 Haiku | Oct 22 2024 | Proprietary | — | https://aireleasetracker.com/model/anthropic/claude-3.5-haiku |
| Claude 3.5 Sonnet (upgraded) | Oct 22 2024 | Proprietary | — | https://aireleasetracker.com/model/anthropic/claude-3.5-sonnet-(upgraded) |
| Claude 3.5 Sonnet | Jun 20 2024 | Proprietary | — | https://aireleasetracker.com/model/anthropic/claude-3.5-sonnet |
| Claude 3 Haiku | Mar 4 2024 | Proprietary | — | https://aireleasetracker.com/model/anthropic/claude-3-haiku |
| Claude 3 Sonnet | Mar 4 2024 | Proprietary | — | https://aireleasetracker.com/model/anthropic/claude-3-sonnet |
| Claude 3 Opus | Mar 4 2024 | Proprietary | — | https://aireleasetracker.com/model/anthropic/claude-3-opus |
| Claude 2.1 | Nov 21 2023 | Proprietary | 200k | https://aireleasetracker.com/model/anthropic/claude-2.1 |
| Claude Instant 1.2 | Aug 9 2023 | Proprietary | 100k | https://aireleasetracker.com/model/anthropic/claude-instant-1.2 |
| Claude 2 | Jul 11 2023 | Proprietary | 100k | https://aireleasetracker.com/model/anthropic/claude-2 |
| Claude 1 | Mar 14 2023 | Proprietary | 9k | https://aireleasetracker.com/model/anthropic/claude-1 |


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Canonical page: https://aireleasetracker.com/company/anthropic
Full dataset: https://aireleasetracker.com/llms-full.txt · JSON: https://aireleasetracker.com/models.json
Source: AI Release Tracker (https://aireleasetracker.com). Most benchmark scores come from lab launch material; gathered results identify the leaderboard that published them.