Key Takeaways
Cogito v2.1 671B wins:
- Cheaper output tokens
- Has reasoning mode
GPT-5.1-Codex wins:
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Better at math
- Supports vision
Price Advantage
Cogito v2.1 671B
Benchmark Advantage
GPT-5.1-Codex
Context Window
GPT-5.1-Codex
Speed
GPT-5.1-Codex
Pricing Comparison
Price Comparison
| Metric | Cogito v2.1 671B | GPT-5.1-Codex | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $1.25 | $1.25 | Tie |
| Output (per 1M tokens) | $1.25 | $10.00 | Cogito v2.1 671B |
| Cache Read (per 1M) | N/A | $0.13 | GPT-5.1-Codex |
Using a 3:1 input/output ratio, Cogito v2.1 671B is 64% cheaper overall.
Cogito v2.1 671B Providers
Fireworks $0.90 (Cheapest)
Together $1.25
GPT-5.1-Codex Providers
OpenAI $1.25 (Cheapest)
Azure $1.25 (Cheapest)
Benchmark Comparison
6
Benchmarks Compared
0
Cogito v2.1 671B Wins
0
GPT-5.1-Codex Wins
Benchmark Scores
| Benchmark | Cogito v2.1 671B | GPT-5.1-Codex | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | - | 43.1 | - |
Coding Index Code generation & understanding | - | 36.6 | - |
Math Index Mathematical reasoning | - | 95.7 | - |
MMLU Pro Academic knowledge | - | 86.0 | - |
GPQA Graduate-level science | - | 86.0 | - |
LiveCodeBench Competitive programming | - | 84.9 | - |
GPT-5.1-Codex significantly outperforms in coding benchmarks.
Cost vs Quality
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Other models
Context & Performance
Context Window
Cogito v2.1 671B
128,000
tokens
GPT-5.1-Codex
400,000
tokens
Max output: 128,000 tokens
GPT-5.1-Codex has a 68% larger context window.
Speed Performance
| Metric | Cogito v2.1 671B | GPT-5.1-Codex | Winner |
|---|---|---|---|
| Tokens/second | N/A | 108.9 tok/s | |
| Time to First Token | N/A | 5.86s |
Capabilities
Feature Comparison
| Feature | Cogito v2.1 671B | GPT-5.1-Codex |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | Cogito v2.1 671B | GPT-5.1-Codex |
|---|---|---|
| License | Open Source | Proprietary |
| Author | Deepcogito | OpenAI |
| Released | Nov 2025 | Nov 2025 |
Cogito v2.1 671B Modalities
Input
text
Output
text
GPT-5.1-Codex Modalities
Input
textimage
Output
text