OpenAI

GPT-5 Nano API pricing.

GPT-5 Nano is OpenAI’s model on the API market, released 7 Aug 2025. Prices are per million tokens in USD, as last read from the price list.

$0.050Input / 1M
$0.40Output / 1M
400KContext
128KMax output
Capability scores
Epoch AI
Epoch Capabilities Index
139
Range 134 to 141 · #129 of 271 models Epoch has scored

The index combines many benchmarks into one general-capability score; the range is how sure Epoch is of the number. Each area score is this site's average of the model's Epoch results in that area, where 0 is what guessing would score and 100 is perfect. Compare every model, and value for money →

Source: Epoch AI, Capabilities & benchmarking (licensed CC BY 4.0). Data refreshed 2 November 2026. These are Epoch's own tests; other benchmark sites can rank models differently.

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Our working on Epoch's index
  1. GLM-5.3-Flash · Z.ai (Zhipu AI)index 153.22 · 68% cheaper
  2. Qwen3.7 Flash · Alibabaindex 144.14 · 60% cheaper
  3. gpt-oss-20b · OpenAIindex 137.75 (2 below) · 60% cheaper
  4. Qwen 3.5 Flash (hosted 35B-A3B) · Alibabaindex 143.61 · 17% cheaper

Models within 5 points of GPT-5 Nano on Epoch's Capabilities Index that cost less, comparing a typical chat mix (three parts input to one part output). A few points of index is a small difference and says nothing about your task: a place to start testing, not a verdict. Capability against price for every model.

Specification
USD per million tokens
Provider
OpenAI
Model id
openai/gpt-5-nano
Input
$0.050
Output
$0.40
Cached input
$0.005
Context window
400K tokens
Maximum output
128K tokens
Takes
text, image, file
Returns
text
Tool use
Yes
Reasoning
Yes
Released
7 Aug 2025
First tracked
17 Sept 2026

At $0.050 per million input tokens, GPT-5 Nano is dearer than 19 of the 340 models on the price list.

Price changes
Tracked since 17 Sept 2026

No price change has been recorded since tracking began on 17 Sept 2026. Prices are checked every six hours, and any change is listed here and on model changes.

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Other entries for this model
More from OpenAI
Cheapest input first
  1. gpt-oss-20b$0.030 in · $0.13 out
  2. gpt-oss-safeguard-20b$0.075 in · $0.30 out
  3. GPT-6 Luna Pro$0.10 in · $0.50 out
  4. GPT-6 Luna$0.10 in · $0.50 out
  5. GPT-4.1 Nano$0.10 in · $0.40 out
  6. gpt-oss-120b$0.15 in · $0.60 out
  7. GPT-4o-mini$0.15 in · $0.60 out
  8. GPT-4o-mini (2024-07-18)$0.15 in · $0.60 out

Prices and specifications come from OpenRouter’s catalogue, last read 2 Nov 2026. A provider’s own price may differ; how this is collected.