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Compare / GPT

GPT · canonical pair

GPT-5.5 vs GPT OSS 120B

Alphabetical by model id, so this URL is the one to index. GPT-5.5 is openai/gpt-5.5. GPT OSS 120B is openai/gpt-oss-120b. Both are among the models the most providers list, inside the GPT group.

A

GPT-5.5

$75.00

per month at the reference workload

  • Reasoning
  • Tool use
  • Structured output
  • Vision
  • Long context

vs

B

GPT OSS 120B

$1.80

per month at the reference workload

  • Reasoning
  • Tool use
  • Structured output
  • Open weights
100 requests a day, 2,000 input tokens and 500 output tokens, no cache hits. A light chat workload so the rate cards are comparable.
SpecGPT-5.5GPT OSS 120B
Monthly, reference workload$75.00$1.80
Input / 1M$5.00$0.15
Output / 1M$30.00$0.60
Cache read / 1M$0.50$0.08
Cache write / 1M——
Context1,050,000131,072
Max output128,00032,768
ReasoningYesYes
Tool callsYesYes
VisionYesNo
Open weightsNoYes
Providers4544
Released2026-04-232025-08-05

Same workload, your numbers

Prices are USD per 1M tokens. A month is 30 days. Cache hits use the cache-read rate when the model has one; otherwise the cache field is ignored.

Estimated monthly cost

GPT-5.5

$75.00

GPT-5.5 costs $73.20 more per month than GPT OSS 120B at these inputs.

monthly = requests/day × 30 × (input tokens × (1 − cache hit) × input price + input tokens × cache hit × cache-read price + output tokens × output price) ÷ 1,000,000