Flagship — best answers, highest costCommercial API

GPT-5.1 Chat Pricing

OpenAI · openai-gpt-5-1-chat

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Input / 1M tokens

$1.25

Output / 1M tokens

$10.00

Context window

128k tokens

≈ 171 pages of text

Max output

32k tokens

What it costs in practice

Typical request (1,200 in + 400 out tokens)$0.0055

1,000 requests / month$5.50/mo 10,000 requests / month$55.00/mo 100,000 requests / month$550.00/mo

Estimate your own workloadOpens the calculator with GPT-5.1 Chat preloaded — adjust volume and token counts there.

Price history

List price per 1M tokens since we started tracking in Jun 2026. The lines are flat because the price hasn't changed since then.

What it excels at

Strong performance on complex reasoning, long-context synthesis, and vision-language tasks with 128k input and 32k output capacity.

The business tradeoff

Elevated output-token pricing increases cost for generation-heavy workloads; commercial API introduces dependency on provider rate limits and policy changes.

Cheaper from OpenAI

GPT-5.4 NanoOpenAI$0.0007/ typical request GPT-5.6 Luna ProOpenAI$0.0004/ typical request GPT-5.4 MiniOpenAI$0.0027/ typical request

Same tier from other providers

Claude Fable 5Anthropic$0.032/ typical request Qwen3.7 PlusQwen$0.0009/ typical request Grok 4.3xAI$0.0025/ typical request

Head-to-head

GPT-5.1 Chat vs Claude Fable 5 →GPT-5.1 Chat vs Qwen3.7 Plus →GPT-5.1 Chat vs Grok 4.3 →

Vendor list rates, as of Jul 27, 2026 · source: openrouter · per-request examples assume 1,200 input + 400 output tokens.