WhichAI / Models / GPT-6 Astra

GPT-6 Astra

· verified September 8, 2026

public paid api in Generator reasoning agents coding vision long-context

Provider

Statuspublic

AA Intelligence Index61.2 (September 8, 2026 snapshot)

Released2026-09-04

Context window1.05M

ModalitiesText + image + files

API price $/1M (in / out)$10 / $50 · $1 per 1M cached input · 128K max output · a Pro tier and a half-price batch tier ship alongside

Speedn/a

AccessReleased September 4, 2026 · API $10/$50 per 1M tokens ($1 cached) · ChatGPT Plus and Pro · batch tier at $5/$25

In one line

OpenAI's next-numbered flagship, shipped September 4 after months of rumour. It ends OpenAI's run of point releases: 1.05M context, native image and file input, and a price that doubles Sol's. Worth knowing before you switch: it scores below both Anthropic flagships on the index, and Sol remains the better value for agentic work at a fifth of the output price.

Coding91

Reasoning93

Writing84

Agents & tools93

Category scores (0-100) are WhichAI blended ratings: public category leaderboards plus editorial judgment. Guidance, not official measurements.

Alternatives worth a look

Grok 4.6 (xAI) · AA 60.9Released August 12, 2026 · API $2/$6 per 1M tokens ($0.50 cached) · in Grok Build and Cursor · SuperGrok subscription
Claude Fable 5 (Anthropic) · AA 62.1Claude Pro / Max plans (usage credits since July 7) · API $10/$50 per 1M tokens
Muse Spark 1.3 (Meta) · AA 62.1Released September 2, 2026 · API $1.25/$4.25 per 1M tokens · Contributor tier $0.10/$0.20

Open GPT-6's official app ↗ Open in the WhichAI app Not sure? Take the 30-second finder

Artificial Analysis Intelligence Index, 2026 rebased scale (top models ~ 55-66). Snapshot: September 4, 2026 (BenchLM mirror), retrieved September 8, 2026. Specs and prices come from the OpenRouter public model list on the same date. Models nobody has measured carry no index score at all and never enter a ranking: where an estimate exists it is shown separately and labelled unmeasured. Context, price, modality and release dates come from the public OpenRouter model list (retrieved September 8, 2026) and vendor pages. Missing values are not published or not yet verified - shown as -. Sources are linked inside the app (Model guide and About > Methodology).