WhichAI / Models / GPT-5.6 Terra

GPT-5.6 Terra

· verified September 8, 2026

public paid api in Generator reasoning value

Provider

Statuspublic

AA Intelligence Index56.6 (September 8, 2026 snapshot)

Released2026-07-09

Context windown/a

Modalitiesn/a

API price $/1M (in / out)$2.5 / $15

Speedn/a

AccessReleased July 9, 2026 · API $2.50/$15 per 1M tokens

In one line

The balanced tier of the GPT-5.6 family - GPT-5.5-level quality at half the price. On track to become the everyday ChatGPT default.

Coding86

Reasoning88

Writing80

Agents & tools86

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

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Head-to-head: GPT-5.6 Terra vs Gemini 3.1 Pro · GPT-5.6 Terra vs Grok 4.5

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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).