Composer 3 release date

Window

Nov 8, 2026 – May 7, 2027

What we know

Announced Jun 16 at Compile: 1.5T parameters trained from scratch on Colossus, codenamed Vega. No official date; August speculation passed.

Spec

Params

Not stated

Active

Not stated

Context

Not stated

Weights

Not stated

Modality

code

Codename

Vega

Why this date

• No basis yet0

  Nobody has named a date, no market prices it, and this lab has no release history on record to extrapolate from. The date shown is a placeholder default, not a forecast.

• Activity without a date0

  Builds, arena entries or version strings are visible but nobody has named a date. Baseline pulled 0% earlier; the window stays wide.

• Slip history1

  Missed 1 previously stated date (2026-08-19). Estimate pushed 4 days later and widened.

• Window tightness1

  80% window spans 180 days (σ ≈ 82.6d).

• Corroboration51

  3 distinct sources, worth 1.8 weighted. Aggregator reposts count for little.

• Source authority0

  No live dated claims; the date comes from a placeholder default.

The signal score is our own weighting of the evidence above. It is not a calibrated probability, and nothing here has been scored against real outcomes yet. Treat “Thin” as the honest summary and the number as its arithmetic.