AI model releases in 2025
Each row is one node from a vendor timeline already published here. This page does not add a release that those timelines do not list. The date and the wording come from that node. The source link is the page that timeline cites.
| Date | Vendor | What the timeline says | Source cited there |
|---|---|---|---|
| 2025-01-31 | OpenAI timeline | o3-mini is launched, a small reasoning model the changelog says is optimized for science, math and coding tasks. | OpenAI API changelog |
| 2025-02-05 | Google timeline | Gemini 2.0 Flash becomes generally available as gemini-2.0-flash-001, and experimental previews of Gemini 2.0 Pro and 2.0 Flash-Lite are released. | Gemini API changelog |
| 2025-02-19 | xAI timeline | Grok 3 is introduced, which xAI says was trained on its Colossus supercluster with 10x the compute of previous state-of-the-art models. | xAI: Grok 3 Beta |
| 2025-02-24 | Anthropic timeline | Claude 3.7 Sonnet arrives as a hybrid model that can answer quickly or show extended step-by-step thinking, and Claude Code is introduced as a research preview. | Anthropic: Claude 3.7 Sonnet and Claude Code |
| 2025-02-25 | Google timeline | Gemini 2.0 Flash-Lite becomes generally available. | Gemini API changelog |
| 2025-02-27 | OpenAI timeline | A research preview of GPT-4.5 is released, which the changelog calls OpenAI’s largest and most capable chat model at the time. | OpenAI API changelog |
| 2025-03-25 | Google timeline | Gemini 2.5 Pro Experimental is released, a public experimental model with thinking mode on by default. | Gemini API changelog |
| 2025-04-14 | OpenAI timeline | GPT-4.1, GPT-4.1 mini and GPT-4.1 nano are released in the API with context windows of up to 1M tokens. | OpenAI API changelog |
| 2025-04-16 | OpenAI timeline | o3 and o4-mini are released as the next o-series reasoning models. | OpenAI API changelog |
| 2025-04-17 | Google timeline | Gemini 2.5 Flash is released in preview, optimized for price-performance and adaptive thinking. | Gemini API changelog |
| 2025-05-22 | Anthropic timeline | Claude 4 launches as two models, Claude Opus 4 and Claude Sonnet 4, both with extended thinking. | Anthropic: Introducing Claude 4 |
| 2025-06-10 | OpenAI timeline | o3-pro is released in the API for harder reasoning problems. | OpenAI API changelog |
| 2025-06-17 | Google timeline | Gemini 2.5 Pro and Gemini 2.5 Flash reach stable versions as gemini-2.5-pro and gemini-2.5-flash. | Gemini API changelog |
| 2025-07-09 | xAI timeline | Grok 4 launches for SuperGrok and Premium+ subscribers and in the xAI API, together with Grok 4 Heavy in a new SuperGrok Heavy tier. | xAI: Grok 4 |
| 2025-07-22 | Google timeline | Gemini 2.5 Flash-Lite is released as a fast, low-cost Gemini 2.5 model. | Gemini API changelog |
| 2025-08-05 | Anthropic timeline | Claude Opus 4.1 ships at the same price as Opus 4, with Anthropic reporting 74.5% on SWE-bench Verified. | Anthropic: Claude Opus 4.1 |
| 2025-08-07 | OpenAI timeline | The GPT-5 family is released in the API: gpt-5, gpt-5-mini and gpt-5-nano, with a new minimal reasoning-effort setting. | OpenAI API changelog |
| 2025-09-19 | xAI timeline | Grok 4 Fast is released as a cost-efficient reasoning model with a 2M token context window. | xAI: Grok 4 Fast |
| 2025-09-29 | Anthropic timeline | Claude Sonnet 4.5 is released, described in the release notes as Anthropic’s best model for complex agents and coding at that time. | Anthropic: Introducing Claude Sonnet 4.5 |
| 2025-10-06 | OpenAI timeline | GPT-5 Pro becomes available in the API. | OpenAI API changelog |
| 2025-10-15 | Anthropic timeline | Claude Haiku 4.5 is released as the fastest Haiku model, aimed at real-time and high-volume work. | Anthropic: Introducing Claude Haiku 4.5 |
| 2025-11-13 | OpenAI timeline | GPT-5.1 is released in the API. | OpenAI API changelog |
| 2025-11-17 | xAI timeline | Grok 4.1 is released on grok.com, X and the mobile apps, focused on creative, emotional and collaborative conversations. | xAI: Grok 4.1 |
| 2025-11-18 | Google timeline | Gemini 3 Pro Preview launches as the first Gemini 3 series model. | Gemini API changelog |
| 2025-11-24 | Anthropic timeline | Claude Opus 4.5 is released, completing the 4.5 generation of Opus, Sonnet and Haiku. | Anthropic: Introducing Claude Opus 4.5 |
| 2025-12-11 | OpenAI timeline | GPT-5.2 is released, with the changelog listing gains over GPT-5.1 in general intelligence, instruction following, vision, front-end code and spreadsheets. | OpenAI API changelog |
| 2025-12-17 | Google timeline | Gemini 3 Flash Preview launches, with upgraded visual and spatial reasoning and agentic coding. | Gemini API changelog |
Sources
Last checked 2026-10-22. Rows are assembled from the vendor timeline posts on this site. Those posts cite each lab’s own announcement. This index does not add dates that are not in those posts.
- OpenAI timeline
- Anthropic timeline
- Google timeline
- xAI timeline
- Meta timeline
- OpenAI API changelog
- Gemini API changelog
- xAI: Grok 3 Beta
- Anthropic: Claude 3.7 Sonnet and Claude Code
- Anthropic: Introducing Claude 4
- xAI: Grok 4
- Anthropic: Claude Opus 4.1
- xAI: Grok 4 Fast
- Anthropic: Introducing Claude Sonnet 4.5
- Anthropic: Introducing Claude Haiku 4.5
- xAI: Grok 4.1
- Anthropic: Introducing Claude Opus 4.5