Compare · ModelsLive · 2 picked · head to head
gpt-oss-120b (free) vs o3
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
o3 wins on 3/4 benchmarks
o3 wins 3 of 4 shared benchmarks. Leads in speed · coding.
Category leads
speed·o3coding·o3
Hype vs Reality
Attention vs performance
gpt-oss-120b (free)
#25 by perf·no signal
o3
#111 by perf·no signal
Vendor risk
Who is behind the model
OpenAI
$840.0B·Tier 1
OpenAI
$840.0B·Tier 1
Head to head
4 benchmarks · 2 models
gpt-oss-120b (free)o3
Artificial Analysis · Agentic Index
o3 leads by +22.9
Artificial Analysis Agentic Index · a composite score measuring how well a model performs in agentic workflows · multi-step tool use, planning, error recovery, and autonomous task completion. Aggregates results from multiple agentic benchmarks including SWE-bench, tool-use tests, and planning evaluations. The canonical single-number metric for "how good is this model as an agent?"
gpt-oss-120b (free)
13.2
o3
36.1
Artificial Analysis · Coding Index
o3 leads by +8.0
Artificial Analysis Coding Index · a composite score that aggregates performance across multiple coding benchmarks into a single index. Tracks code generation quality, debugging ability, multi-language competence, and real-world software engineering tasks. Used by Artificial Analysis to rank model coding capability in a normalized, comparable format. Useful for developers choosing between models for coding-heavy workloads.
gpt-oss-120b (free)
30.4
o3
38.4
Artificial Analysis · Quality Index
gpt-oss-120b (free) leads by +3.6
gpt-oss-120b (free)
23.8
o3
20.2
Aider polyglot
o3 leads by +39.5
Aider Polyglot · measures how well AI models can edit code across multiple programming languages using the Aider coding assistant framework.
gpt-oss-120b (free)
41.8
o3
81.3
Full benchmark table
| Benchmark | gpt-oss-120b (free) | o3 |
|---|---|---|
Artificial Analysis · Agentic Index Artificial Analysis Agentic Index · a composite score measuring how well a model performs in agentic workflows · multi-step tool use, planning, error recovery, and autonomous task completion. Aggregates results from multiple agentic benchmarks including SWE-bench, tool-use tests, and planning evaluations. The canonical single-number metric for "how good is this model as an agent?" | 13.2 | 36.1 |
Artificial Analysis · Coding Index Artificial Analysis Coding Index · a composite score that aggregates performance across multiple coding benchmarks into a single index. Tracks code generation quality, debugging ability, multi-language competence, and real-world software engineering tasks. Used by Artificial Analysis to rank model coding capability in a normalized, comparable format. Useful for developers choosing between models for coding-heavy workloads. | 30.4 | 38.4 |
Artificial Analysis · Quality Index | 23.8 | 20.2 |
Aider polyglot Aider Polyglot · measures how well AI models can edit code across multiple programming languages using the Aider coding assistant framework. | 41.8 | 81.3 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $0.00 | $0.00 | 131K tokens (~66 books) | — | |
| $2.00 | $8.00 | 200K tokens (~100 books) | $35.00 |