openai / text-generation API-only released 2025-11-13

GPT-5.1

Name: GPT-5.1
Price: 1.25 USD
Author: openai

GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5. It uses adaptive reasoning...

Input / 1M

$1.25

Output / 1M

$10.00

Context

400K

AA Intelligence

24.7

Closed weights — available only as a hosted API image + text + file → text View on OpenRouter ↗

Pricing

via OpenRouter · USD per 1M tokens · synced 2026-10-24

$1.25

input / 1M

$10.00

output / 1M

$0.13

cached input / 1M

$11.25

1M in + 1M out

:batch variant $0.63 in · $5.00 out

Context window: 400,000 tokens
Max output: 128,000 tokens
Providers: 2
Cheapest provider: OpenAI · $0.63 / $5.00
Best throughput: —
AA Intelligence / Coding / Agentic: 24.7 / 49.4 / —

✓ Tool calling ✓ Reasoning ✓ Structured outputs ✓ Image input ✓ File input ✗ Audio input ✓ Prompt caching

Price history

tracking started — chart appears after 7 days of snapshots (6 recorded)

Current: $1.25 input · $10.00 output per 1M tokens

Benchmarks

Third-party indices as published through OpenRouter — Artificial Analysis and Design Arena. Not measured by us.

AA Intelligence Index: 24.7
AA Coding Index: 49.4
AA Agentic Index: —

Design Arena

CategoryEloWin %Rank

3d 1061 43.7% #102

asciiart 1119 48.6% #55

codecategories 1171 53% #72

dataviz 1204 58% #57

gamedev 1179 55.9% #63

svg 1149 57.4% #48

uicomponent 1164 52.9% #72

website 1187 54% #72

Providers

2 providers · per 1M tokens · last 30 min metrics

Provider	Quant	Context	Input	Output	Uptime	Tok/s
OpenAI	unknown	400K	$0.63	$5.00	—	—
Azure	unknown	400K	$1.25	$10.00	—	—
OpenAI	unknown	400K	$1.25	$10.00	100%	—
Azure	unknown	400K	$1.38	$11.00	—	—
OpenAI	unknown	400K	$2.50	$20.00	—	—

Provider data from OpenRouter's endpoint listing, refreshed daily.

Specifications

Organisation: openai
Released on OpenRouter: 2025-11-13
Context window: 400,000 tokens
Max output: 128,000 tokens
Input: image, text, file
Output: text
Tokenizer: GPT
Moderated by provider: Yes
OpenRouter id: openai/gpt-5.1

Compare with

Popular comparisons

DeepSeek-V4.1-Flash open $0.27 Ling-3.0-flash-VL open $0.09 Inkling open $1.76 DeepSeek-V4-Flash open $0.11 Hy3-preview open $0.29 GPT-5.1-Codex $3.44 GPT-5 $3.44 Grok 4.3 $1.56 GPT-5.4 Mini $1.69 GLM 5V Turbo $1.90

Browse

All API-only models Open-weights alternatives Best value via API

Prices, context and providers from the public OpenRouter API, snapshotted daily; benchmark indices from Artificial Analysis. See /methodology.