Flagship — best answers, highest costCommercial API

GPT-5.1 Pricing

OpenAI · openai-gpt-5-1

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Input / 1M tokens

$1.25

Output / 1M tokens

$10.00

Context window

400k tokens

≈ 533 pages of text

Max output

128k 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 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 long-context reasoning and multi-step analytical tasks supported by 400k input and 128k output windows.

The business tradeoff

Output pricing at $10 per million tokens increases cost for generation-heavy workloads; newer release may show higher variance in production stability than prior GPT versions.

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

Vendor list rates, as of Jul 13, 2026 · source: openrouter · per-request examples assume 1,200 input + 400 output tokens.