OpenAI

gpt-oss-120b API pricing.

gpt-oss-120b is OpenAI’s model on the API market, released 5 Aug 2025. Prices are per million tokens in USD, as last read from the price list.

$0.15Input / 1M
$0.60Output / 1M
131KContext
66KMax output
Capability scores
Epoch AI
Epoch Capabilities Index
140
Range 136 to 142 · #125 of 271 models Epoch has scored
Reasoning and puzzles
0average of 1 of 2 Epoch results
Mystery game puzzles (medium)2.0%

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 · 83% cheaper
  2. Qwen3.7 Flash · Alibabaindex 144.14 · 79% cheaper
  3. gpt-oss-20b · OpenAIindex 137.75 (2 below) · 79% cheaper
  4. Qwen 3.5 Flash (hosted 35B-A3B) · Alibabaindex 143.61 · 57% cheaper

Models within 5 points of gpt-oss-120b 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-oss-120b
Input
$0.15
Output
$0.60
Cached input
$0.075
Context window
131K tokens
Maximum output
66K tokens
Takes
text
Returns
text
Tool use
Yes
Reasoning
Yes
Released
5 Aug 2025
First tracked
17 Sept 2026

At $0.15 per million input tokens, gpt-oss-120b is dearer than 85 of the 340 models on the price list.

Price changes
Tracked since 17 Sept 2026
gpt-oss-120b price per million tokens over timeFree$0.50$1.0017 Sept2 Nov
InputOutput
  1. Input $0.010 → $0.15 · Output $0.037 → $0.60
  2. Input $0.15 → $0.010 · Output $0.60 → $0.037
  3. Input $0.017 → $0.15 · Output $0.063 → $0.60
  4. Input $0.020 → $0.017 · Output $0.072 → $0.063
  5. Input $0.028 → $0.020 · Output $0.10 → $0.072
  6. Input $0.15 → $0.028 · Output $0.60 → $0.10

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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-5 Nano$0.050 in · $0.40 out
  3. gpt-oss-safeguard-20b$0.075 in · $0.30 out
  4. GPT-6 Luna Pro$0.10 in · $0.50 out
  5. GPT-6 Luna$0.10 in · $0.50 out
  6. GPT-4.1 Nano$0.10 in · $0.40 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.