WhichAI / Models / GPT-5.6 Terra

GPT-5.6 Terra

· verified October 14, 2026

public paid api in Generator reasoning value

Provider

Statuspublic

AA Intelligence Index42.1 (official, read October 14, 2026)

Released2026-07-09

Context window1.05M

Modalitiesn/a

API price $/1M (in / out)$2 / $12 (OpenRouter)

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, official scale (the number published on artificialanalysis.ai), relayed by OpenRouter and refreshed automatically: last read October 14, 2026. 209 models carry a current official measurement. A value marked ~ is converted from an earlier snapshot because no current measurement is published; an unmeasured model is never ranked. Context, price, modality and listing dates come from the public OpenRouter model list (refreshed automatically on the live site; static copy retrieved October 3, 2026) and vendor pages. Missing values are not published or not yet verified - shown as -. Sources are linked inside the app (the Ranking chapter and About > Methodology).