OpenAI: GPT-5.6 Terra

openai/gpt-5.6-terra

GPT-5.6 Terra is OpenAI's flagship and ranks #20 of 234 on the TryAii Score, 0.2 points behind Qwen3.7 Max. It's strongest on knowledge (#17 on GPQA). At $2/$12 per million input/output tokens it's priced about level with its class and it's among the fastest models we track, at roughly 65-79 tokens/sec.

Prompt $/1M

$2.000

Completion $/1M

$12.000

Context

1,050,000 tok

Best provider

98 tok/s · Artificial Analysis

Specs

Model id: openai/gpt-5.6-terra
Display name: OpenAI: GPT-5.6 Terra
Modality: text+image+file->text
Tokenizer: GPT
Instruct type: —
Context length: 1,050,000
Max completion: 128,000
Prompt $/1M: $2.000
Completion $/1M: $12.000
Free tier: no

Capabilities

Function callingno
JSON modeno
System promptno
Visionno
Moderatedyes

Benchmark scores

Each axis is one benchmark, normalized to the best model in the field.

No benchmark data for this model.

Speed by provider

Provider	tok/s	TTFT	Total latency
Artificial Analysis	98	99,106 ms	—
Amazon Bedrock	73	2,045 ms	2,315 ms
OpenAIfastest	69	2,471 ms	3,158 ms
Azure	55	4,378 ms	5,492 ms

Prompt caching by provider

Provider	Min tokens to cache	Notes
OpenAI	1,024 tokens	GPT-5.6 family — first OpenAI generation with a cache-write premium (1.25x input on cold writes; single-use large prompts pay it for nothing). Docs cite prefixes staying reusable at least 30 min.
Amazon Bedrock	1,024 tokens	GPT-5.6 on Bedrock: explicit cachePoint (unlike OpenAI direct where it is automatic); 30-min TTL; 90% read discount, 1.25x write premium.