This tracker lists the newest AI models from Anthropic, OpenAI and Google. Model names and IDs are checked against each company’s official documentation: the Claude models overview, the OpenAI models page and the Gemini API changelog. Release dates are only given when an official page shows them.
TL;DR: Google’s changelog shows Gemini 4 Argon generally available on October 13, 2026. OpenAI’s models page lists GPT-6 Astra, GPT-6.1 Sol, GPT-6.1 Terra and GPT-6 Luna. Anthropic’s page lists Claude Fable 5.1, Opus 5.5, Sonnet 5.5 and Haiku 5.5.
Last updated: November 1, 2026.
Latest model by company
| Company | Newest flagship listed | Model ID | Date shown by the company |
|---|---|---|---|
| Anthropic | Claude Fable 5.1 | claude-fable-5-1 | Not shown on the docs page |
| OpenAI | GPT-6 Astra (most capable) | gpt-6-astra | Not shown on the docs page |
| Gemini 4 Argon | gemini-4-argon | October 13, 2026 |
Gemini 4 Argon (October 13, 2026)
- What it is: Google’s newest Gemini model, listed in the Gemini API changelog as generally available for complex coding, agentic, math and science tasks.
- Model ID: gemini-4-argon.
- Earlier: coverage dated September 30 described Gemini 4 Argon as a limited preview for vetted cyber defenders, per Presenc AI. The October 13 changelog entry is the general availability date.
- What it means for you: developers can call it through the Gemini API. Consumer app availability is not covered by the changelog.
Source: Gemini API changelog.
Claude Haiku 5.5 (reported October 7, 2026)
- What it is: the smallest model in the current Claude family, listed for high-volume, latency-sensitive work such as classification and routing.
- Model ID: claude-haiku-5-5.
- Date: October 7 comes from a single outlet, TLDL, and Anthropic’s docs page shows no release dates, so treat the date as unconfirmed.
- Family: Anthropic’s page lists four current models, Fable 5.1, Opus 5.5, Sonnet 5.5 and Haiku 5.5, all with a 1M token context window.
Source: Claude models overview.
OpenAI GPT-6 family (September 2026, reported)
- What OpenAI lists: GPT-6 Astra (gpt-6-astra), GPT-6.1 Sol (gpt-6.1-sol), GPT-6.1 Terra (gpt-6.1-terra) and GPT-6 Luna (gpt-6-luna). The page calls Astra the most capable and Sol close to it at lower cost.
- Dates: Presenc AI reports Astra on September 4, Sol and Luna on September 22, and GPT-6.1 Sol on September 29. Another outlet dates a wider ChatGPT launch to October 7. OpenAI’s models page shows no release dates, so these dates conflict and stay unconfirmed.
Source: OpenAI models page.
Gemini 3.8 Flash (September 2, 2026)
- What it is: a fast Gemini model, listed as generally available on September 2, 2026.
- Model ID: gemini-3.8-flash.
- Earlier Flash models: Gemini 3.7 Flash on August 13 and Gemini 3.6 Flash on July 21, 2026.
Source: Gemini API changelog.
Claude Fable 5 and Mythos 5 (June 9, 2026)
- What it is: the first release of the Fable and Mythos tier from Anthropic, released June 9, 2026.
- Access: Anthropic suspended access to both on June 12 to comply with US export controls, then restored it on July 1 after the Department of Commerce lifted them on June 30, per Anthropic’s statement.
Source: Anthropic statement on Fable and Mythos access.
For a recent look at how Google is wiring Gemini into apps, see our report on Gemini connected apps.
Frequently Asked Questions
What is the latest Gemini model?
Gemini 4 Argon, listed as generally available in Google’s changelog on October 13, 2026.
What is the latest OpenAI model?
OpenAI’s models page lists GPT-6 Astra, GPT-6.1 Sol, GPT-6.1 Terra and GPT-6 Luna. Exact release dates are not shown there.
What is the latest Claude model?
Anthropic’s page lists Claude Fable 5.1, Opus 5.5, Sonnet 5.5 and Haiku 5.5 as current models.
