Minor changes to the name, or other names for a model generally expected to be called Claude Mythos, will count for the purpose of this market.

The model must be accessible without individual vetting or invitation — free or paid, via API or product. Open, non-selective waitlists count. Closed betas, invite-only access, researcher programs, A/B tests, and anonymous benchmark appearances do not. Country-level bans do not prevent resolution.

See also:

Grok 5 (xAI) release date

Gemini 3.2 (Google) release date

Gemini 3.5 (Google) release date

Gemini 4.0 (Google) release date

GPT 5.5 (OpenAI) release date

GPT 6 (OpenAI) release date

Claude 5 (Anthropic) release date

Claude Mythos (Anthropic) release date (this market)

V4 (DeepSeek) release date

R2 / V4-Thinking (DeepSeek) release date

Llama 5 (Meta) release date

Qwen 4 (Alibaba Qwen) release date

Kimi K3 (Moonshot) release date

GLM 5.5 (Z.ai) release date

M3 (Minimax) release date

Gemma 4 (Google) release date

OpenAI's next "GPT-OSS" release date

Thinking Machines' first LLM announcement date

Veo 4 (Google) release date

New image / video "Mango" model (Meta) release date

'Avocado' LLM (Meta) release date