Verified 2025-11-26 · sourced from OpenAI
GPT-5.1 Token Calculator & Cost Guide
Estimate OpenAI GPT-5.1 API usage in dollars before you send a single request. Standard pricing is $1.25 per million input tokens and $10.00 per million output tokens with a 200K token context window.
Context window
200,000 tokens
Input price
$1.25 / 1M
Output price
$10.00 / 1M
Cached input
$0.125 / 1M
Usage scenarios
Compare standard and cached pricing (where available) across common workloads.
| Scenario | Tokens in | Tokens out | Total tokens | Standard cost | Cached cost |
|---|---|---|---|---|---|
Quick chat reply Single user question with a short assistant answer | 650 | 220 | 870 | $0.0030 | $0.0023 |
Coding assistant session Multi-turn pair programming exchange (≈6 turns) | 2,600 | 1,400 | 4,000 | $0.0173 | $0.0143 |
Knowledge base response Retrieval-augmented answer referencing multiple passages | 12,000 | 3,000 | 15,000 | $0.0450 | $0.0315 |
Near-max context run Large document processing approaching the 200K token limit | 176,000 | 24,000 | 200,000 | $0.460 | $0.262 |
Daily & monthly budgeting
Translate usage into predictable operating expenses across popular deployment sizes.
| Profile | Requests/day | Tokens/day | Daily cost | Monthly cost | Cached daily | Cached monthly |
|---|---|---|---|---|---|---|
| Team pilot | 25 | 75,000 | $0.313 | $9.38 | $0.256 | $7.69 |
| Product launch | 100 | 500,000 | $1.94 | $58.13 | $1.54 | $46.31 |
| Enterprise scale | 500 | 3,000,000 | $12.50 | $375.00 | $10.25 | $307.50 |
Pricing notes
- Previous GPT-5 flagship with Instant and Thinking modes (Nov 2025)
- Cached input pricing: 90% discount at $0.125 per 1M tokens
Frequently asked questions
How much does GPT-5.1 cost per 1,000 tokens?
At the published rates of $1.25 per million input tokens and $10.00 per million output tokens, a typical 1,000 token request (≈70% input, 30% output) costs about $0.0039.
Does GPT-5.1 offer cached input discounts?
GPT-5.1 drops input costs to $0.125 per million cached tokens. Using cached contexts, that same 1,000 token call totals $0.0031, a significant saving for chatbots and RAG systems.
What is the context window for GPT-5.1?
GPT-5.1 supports up to 200,000 tokens (200K), allowing large prompts and retrieval-augmented payloads in a single call.
How fresh is the GPT-5.1 pricing data?
Pricing is sourced from https://platform.openai.com/docs/pricing and was last verified on 2025-11-26. The calculator updates automatically when models.json is refreshed.