GPT-5.1 Chat Latest

Updated Sep 11, 2026

gpt-codex400k context128k max outputreleased Nov 13, 2025ReasoningTool calling

Cheapest input

$1.25

Cheapest output

$10

Official

—

output per 1M tokens

Providers

offering this model

Spread

1.0×

max / min output

Offers

Metered per-token prices. Cheapest input and output are highlighted; † marks a context-tier surcharge.

Provider	1M input	1M output	1M cache read	1M cache write	Context
302.AI	Cheapest$1.25	Cheapest$10	—	—	128k
Abacus	$1.25	$10	—	—	400k
Helicone	$1.25	$10	$0.125	—	128k
Merge Gateway	$1.25	$10	$0.125	—	128k
OrcaRouter	$1.25	$10	$0.125	—	128k