Key Takeaways
Olmo 3.1 32B Instruct wins:
- Cheaper input tokens
- Cheaper output tokens
GPT-5.3 Codex wins:
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Supports vision
- Has reasoning mode
Price Advantage
Olmo 3.1 32B Instruct
Benchmark Advantage
GPT-5.3 Codex
Context Window
GPT-5.3 Codex
Speed
GPT-5.3 Codex
Pricing Comparison
Price Comparison
| Metric | Olmo 3.1 32B Instruct | GPT-5.3 Codex | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $0.20 | $1.75 | Olmo 3.1 32B Instruct |
| Output (per 1M tokens) | $0.60 | $14.00 | Olmo 3.1 32B Instruct |
| Cache Read (per 1M) | N/A | $0.17 | GPT-5.3 Codex |
Using a 3:1 input/output ratio, Olmo 3.1 32B Instruct is 94% cheaper overall.
Olmo 3.1 32B Instruct Providers
No provider data available
GPT-5.3 Codex Providers
No provider data available
Benchmark Comparison
3
Benchmarks Compared
0
Olmo 3.1 32B Instruct Wins
3
GPT-5.3 Codex Wins
Benchmark Scores
| Benchmark | Olmo 3.1 32B Instruct | GPT-5.3 Codex | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 12.2 | 54.0 | |
Coding Index Code generation & understanding | 5.6 | 53.1 | |
GPQA Graduate-level science | 53.9 | 91.5 |
GPT-5.3 Codex significantly outperforms in coding benchmarks.
Cost vs Quality
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Other models
Context & Performance
Context Window
Olmo 3.1 32B Instruct
65,536
tokens
GPT-5.3 Codex
400,000
tokens
GPT-5.3 Codex has a 84% larger context window.
Speed Performance
| Metric | Olmo 3.1 32B Instruct | GPT-5.3 Codex | Winner |
|---|---|---|---|
| Tokens/second | 53.5 tok/s | 70.2 tok/s | |
| Time to First Token | 0.25s | 88.66s |
GPT-5.3 Codex responds 31% faster on average.
Capabilities
Feature Comparison
| Feature | Olmo 3.1 32B Instruct | GPT-5.3 Codex |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | Olmo 3.1 32B Instruct | GPT-5.3 Codex |
|---|---|---|
| License | Open Source | Proprietary |
| Author | Allenai | OpenAI |
| Released | Jan 2026 | Feb 2026 |
Olmo 3.1 32B Instruct Modalities
Input
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Output
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GPT-5.3 Codex Modalities
Input
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Output
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