OpenAI: GPT-5.1-Codex-Mini

OpenAI: GPT-5.1-Codex-Mini is a large language model from OpenAI. It costs $0.250 per million input tokens and $2.00 per million output tokens. Its context window is 400K tokens.

ReasoningTool callingStructured outputPrompt cachingimage input

Input / 1M tokens: $0.250
Output / 1M tokens: $2.00
Cached input / 1M: $0.030
Context window: 400K

This model also charges $0.01 per search request

That is $10.00 per 1,000 requests, billed on top of the token prices above. On a typical 1,000-in / 500-out exchange the tokens cost $0.0013, so the search fee is 8.0× the token cost. Per-token rankings elsewhere ignore this entirely.

Who serves it cheapest

1 hosts serve GPT-5.1-Codex-Mini. Same weights, same API - the price difference is pure margin and routing.

Providers serving OpenAI: GPT-5.1-Codex-Mini, cheapest first
Provider	Input / 1M	Output / 1M	Context	Throughput	Uptime 24h
AzureCheapest	$0.250	$2.00	400K	-	100.0%

About GPT-5.1-Codex-Mini

GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex

Specifications

OpenAI: GPT-5.1-Codex-Mini specifications
Model ID	`openai/gpt-5.1-codex-mini`
Provider	OpenAI
Context window	400K tokens
Max output	128K tokens
Input modalities	image, text
Output modalities	text
Knowledge cutoff	-
Open weights	No
Released	November 13, 2025

Cheaper alternatives

Models that cost less than GPT-5.1-Codex-Mini while keeping at least half its context window and every input modality it supports.

Qwen3.5 Plus 2026-04-20

$0.300 in · $1.80 out

about the same cheaper

Inkling Small

$0.450 in · $1.20 out

1.1× cheaper

Qwen3 VL 235B A22B Instruct

$0.210 in · $1.90 out

1.1× cheaper

Qwen3.5 Plus 2026-02-15

$0.260 in · $1.56 out

1.2× cheaper

Gemini 3.1 Flash Lite

$0.250 in · $1.50 out

1.2× cheaper

Frequently asked

How much does OpenAI: GPT-5.1-Codex-Mini cost?

$0.250 per million input tokens and $2.00 per million output tokens. Cached input reads cost $0.030 per million tokens.

What is the context window of OpenAI: GPT-5.1-Codex-Mini?

400K tokens, with up to 128K tokens of output per request.

Does OpenAI: GPT-5.1-Codex-Mini have extra fees beyond per-token pricing?

Yes. OpenAI: GPT-5.1-Codex-Mini charges $0.01 per search request - $10.00 per 1,000 requests - on top of $0.250 per million input tokens and $2.00 per million output tokens. On a typical 1,000-input / 500-output exchange the search fee alone is 8.0× the token cost.

Confirm against the source: OpenAI official pricing.