OpenAI

Timeline

1. Sep 29, 2026OpenAI

   Model

   GPT-6.1 Sol (DevDay 2026)

   Near-Astra coding and computer use at a fifth of Astra's API price, launched at DevDay.

2. Sep 22, 2026OpenAI

   Model

   GPT-6 Sol & Luna

   Two cheaper GPT-6 tiers that balance capability and cost for everyday work.

3. Sep 10, 2026OpenAI

   Product

   Agents API

   A managed service for building cloud agents on the Codex harness, with long-running sessions.

4. Sep 8, 2026OpenAI

   Research

   ★ Landmark

   Claimed Navier–Stokes proof

   OpenAI published an AI-generated claimed Millennium Prize solution with a Lean proof; still under review.

5. Sep 3, 2026OpenAI

   Model

   ★ Landmark

   GPT-6 Astra

   OpenAI's most intelligent and aligned model yet: state of the art in computer use, coding and science.

6. Aug 11, 2026OpenAI

   Product

   Ads in ChatGPT (test)

   OpenAI began testing clearly labeled ads to fund free access; expanded to Europe a week later.

7. Jul 23, 2026OpenAI

   Product

   Health in ChatGPT

   US users can securely connect medical records and Apple Health for personalized insights.

8. Jul 9, 2026OpenAI

   Model

   ★ Landmark

   GPT-5.6

   More intelligence per token and per dollar; became Microsoft 365 Copilot's preferred model at launch.

9. Jul 8, 2026OpenAI

   Product

   GPT-Live voice models

   New natural-conversation voice models powering ChatGPT Voice; GPT-Live-1 hit the API in September.

10. Jun 24, 2026OpenAI

    Product

    Jalapeño inference chip (with Broadcom)

    A custom chip co-designed with Broadcom specifically for LLM inference at scale.

11. Apr 23, 2026OpenAI

    Model

    ★ Landmark

    GPT-5.5

    OpenAI's smartest and most intuitive model yet, framed as a step toward an AI super app.

12. Feb 5, 2026OpenAI

    Model

    GPT-5.3-Codex

    Most capable agentic coding model to date, 25% faster while advancing reasoning.

13. Dec 11, 2025OpenAI

    Model

    GPT-5.2

    Most capable model for professional knowledge work, topping GDPval across 44 occupations.

14. Nov 13, 2025OpenAI

    Model

    GPT-5.1

    A smarter, more conversational GPT-5 update with adaptive reasoning that adjusts thinking time.

15. Oct 6, 2025OpenAI

    Product

    DevDay 2025: AgentKit & Apps SDK

    Shipped AgentKit, an Apps SDK on MCP, and GPT-5 Pro to make ChatGPT an agent-building platform.

16. Sep 30, 2025OpenAI

    Model

    ★ Landmark

    Sora 2

    A more physically accurate video model with synchronized audio, launched with a social app.

17. Aug 7, 2025OpenAI

    Model

    ★ Landmark

    GPT-5

    Unified flagship with a real-time router between fast and deep-reasoning models for all users.

18. Aug 5, 2025OpenAI

    Open weights

    ★ Landmark

    gpt-oss-120b and gpt-oss-20b

    OpenAI's first open-weight models since GPT-2, Apache 2.0 and near o4-mini reasoning quality.

19. Jul 17, 2025OpenAI

    Product

    ChatGPT agent

    Unified agent combining Operator, deep research, and ChatGPT on its own virtual computer.

20. Apr 16, 2025OpenAI

    Model

    ★ Landmark

    o3 and o4-mini

    Frontier reasoning models that agentically use every ChatGPT tool, setting new math/coding records.

21. Apr 14, 2025OpenAI

    Model

    GPT-4.1 family

    API models with 1M-token context and major coding and instruction-following gains over GPT-4o.

22. Mar 31, 2025OpenAI

    Funding

    ★ Landmark

    $40B round at $300B valuation

    The largest private tech fundraise on record, led by SoftBank, doubling OpenAI's valuation.

23. Feb 27, 2025OpenAI

    Model

    GPT-4.5

    OpenAI's largest non-reasoning model, released as a research preview.

24. Feb 2, 2025OpenAI

    Product

    Deep research

    Agentic ChatGPT feature that synthesizes hundreds of web sources into analyst-grade reports.

25. Jan 23, 2025OpenAI

    Product

    Operator

    OpenAI's first computer-using agent that browses the web to complete tasks autonomously.