Flagship — best answers, highest costCommercial API

GPT-5.5 Pro Pricing

OpenAI · openai-gpt-5-5-pro

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Input / 1M tokens

$30.00

Output / 1M tokens

$180.00

Context window

1050k tokens

≈ 1,400 pages of text

Max output

128k tokens

What it costs in practice

Typical request (1,200 in + 400 out tokens)$0.108

1,000 requests / month$108.00/mo 10,000 requests / month$1,080.00/mo 100,000 requests / month$10,800.00/mo

Estimate your own workloadOpens the calculator with GPT-5.5 Pro preloaded — adjust volume and token counts there.

Price history

Only one price point recorded so far.

The staircase chart appears once a price change is detected.

What it excels at

Processes 1M-token contexts and generates up to 128k output tokens, supporting extended document analysis and multi-step reasoning chains.

The business tradeoff

Output pricing of $180 per million tokens raises costs for generation-heavy workloads. Commercial API hosting creates dependency on provider availability and rate limits.

Cheaper from OpenAI

GPT-5.6 Luna ProOpenAI$0.0004/ typical request GPT-5.5 (batch)OpenAI$0.009/ 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-5.5 Pro vs Claude Fable 5 →GPT-5.5 Pro vs Qwen3.7 Plus →GPT-5.5 Pro vs Grok 4.3 →

Vendor list rates, as of Jun 15, 2026 · source: openrouter · per-request examples assume 1,200 input + 400 output tokens.