Truth Check/7 October 2026

“Mistral Large 4: 1 trillion parameters, 52 billion active, preview API at $1.36 in / $4.18 out per million tokens, weights by the end of October”

The claim as it travelled: Mistral, 6 Oct 2026.

Mistral's page: 1 trillion parameters, now 52 billion active (49 billion on 6-7 Oct, changed by Mistral on 8 Oct), $1.36 in / $4.18 out, weights by month-end.

Checked Against

mistral.ai ↗Primary

Read the Check

A trillion-parameter model for $1.36 a million tokens, open-weight by month-end, that does the cyber work Claude and GPT refuse. OpenAI's 722 maths papers: 4,000 problems in, not all checked.

Mistral's open weights against Anthropic's three vetted tiers - two answers, one day, to who gets the model that proves a flaw is real; "OpenAI's AI produced 722 new mathematical results" against the repository's own README; and the record check, one prompt that tells you whether your agent can edit its own history.

Every claim we have checked, in the Ledger.