WhichAI / Models / GPT-5.6 Terra

GPT-5.6 Terra

· verified July 26, 2026

public paid api in Generator reasoning value

Provider

Statuspublic

AA Intelligence Index55 (July 16, 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.

Alternatives worth a look

GPT-5.5 (OpenAI) · AA 54.8Free (limited messages) · Plus $20/mo · Go ~$8/mo · API
Claude Opus 4.8 (Anthropic) · AA 55.7Claude Pro $20/mo · API
Grok 4.5 (xAI) · AA 53.8Released July 8, 2026 · API $2/$6 per 1M tokens · in Grok Build & Cursor · not yet in the EU

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 ≈ 55–60). Snapshot: July 24, 2026 (BenchLM mirror), retrieved July 26, 2026. Context, price and release data come from vendor pages and public pricing mirrors (retrieved July 19, 2026). Missing values are not published or not yet verified - shown as -. Sources are linked inside the app (Model guide and About > Methodology).