Compare · ModelsLive · 2 picked · head to head
GPT-5 Chat vs gpt-oss-120b (free)
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GPT-5 Chat wins on 1/1 benchmarks
GPT-5 Chat wins 1 of 1 shared benchmarks. Leads in coding.
Category leads
coding·GPT-5 Chat
Hype vs Reality
Attention vs performance
GPT-5 Chat
#1 by perf·#1 by attention
gpt-oss-120b (free)
#20 by perf·no signal
Vendor risk
Who is behind the model
OpenAI
$840.0B·Tier 1
OpenAI
$840.0B·Tier 1
Head to head
1 benchmark · 2 models
GPT-5 Chatgpt-oss-120b (free)
Aider polyglot
GPT-5 Chat leads by +46.2
Aider Polyglot · measures how well AI models can edit code across multiple programming languages using the Aider coding assistant framework.
GPT-5 Chat
88.0
gpt-oss-120b (free)
41.8
Full benchmark table
| Benchmark | GPT-5 Chat | gpt-oss-120b (free) |
|---|---|---|
Aider polyglot Aider Polyglot · measures how well AI models can edit code across multiple programming languages using the Aider coding assistant framework. | 88.0 | 41.8 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| GPT-5 Chat | $1.25 | $10.00 | 128K tokens (~64 books) | $34.38 |
| gpt-oss-120b (free) | $0.00 | $0.00 | 131K tokens (~66 books) | — |