GPT-5.1-Codex-Mini is $1 cheaper per 1M input tokens (80% lower; 5x difference).
API cost decision in 10 seconds
Cogito v2.1 671B vs GPT-5.1-Codex-Mini
Pick GPT-5.1-Codex-Mini when budget and context both matter.
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Data confirmed:
Prices normalized to USD per 1M tokens
Sample workload: 1M input + 500K output
Budget verdict
Pick GPT-5.1-Codex-Mini when budget and context both matter.
On the standard 1M input plus 500K output workload, GPT-5.1-Codex-Mini is estimated at $1.25 vs $1.88 for Cogito v2.1 671B, saving $0.62 (33.3% lower).
Cost-first pickGPT-5.1-Codex-Mini
Context-first pickGPT-5.1-Codex-Mini
Sample savings$0.6233.3%
10x traffic gap$6.25
GPT-5.1-Codex-Mini is cheaper on the standard workload and also has the larger context window. At 10x that traffic, the same price gap is about $6.25. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
Cost winner changes by workload shape: input-heavy / RAG favors GPT-5.1-Codex-Mini, balanced workload favors GPT-5.1-Codex-Mini, and output-heavy chatbot favors Cogito v2.1 671B.
| Workload shape | Token mix | Better pick | Cogito v2.1 671B | GPT-5.1-Codex-Mini |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | GPT-5.1-Codex-Mini | $6.88 | $2.25 |
| Balanced workload | 1M input + 1M output | GPT-5.1-Codex-Mini | $2.5 | $2.25 |
| Output-heavy chatbot | 1M input + 5M output | Cogito v2.1 671B | $7.5 | $10.25 |
Cogito v2.1 671B is $0.75 cheaper per 1M output tokens (37.5% lower; 1.6x difference).
GPT-5.1-Codex-Mini has 272K more context (3.12x larger).
GPT-5.1-Codex-Mini is $0.62 cheaper on the standard workload (33.3% lower).
Estimate your workload cost
Your Workload Cost
This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.
Quick Decision
GPT-5.1-Codex-Mini has the lower input price; Cogito v2.1 671B has the lower output price; GPT-5.1-Codex-Mini offers the larger context window. For the 1M input plus 500K output sample, GPT-5.1-Codex-Mini is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $1.88 for Cogito v2.1 671B and $1.25 for GPT-5.1-Codex-Mini.
Choose Cogito v2.1 671B when you care most about lower output-token price.
Choose GPT-5.1-Codex-Mini when you care most about lower input-token price, and larger context window.
- On the standard 1M input plus 500K output workload, GPT-5.1-Codex-Mini is estimated at $1.25 vs $1.88 for Cogito v2.1 671B, saving $0.62 (33.3% lower).
- GPT-5.1-Codex-Mini is $0.62 cheaper on the standard workload (33.3% lower).
- GPT-5.1-Codex-Mini is $1 cheaper per 1M input tokens (80% lower; 5x difference).
- Cogito v2.1 671B is $0.75 cheaper per 1M output tokens (37.5% lower; 1.6x difference).
- GPT-5.1-Codex-Mini has 272K more context (3.12x larger).
| Feature | Cogito v2.1 671B (Deep Cogito) | GPT-5.1-Codex-Mini (OpenAI) |
|---|---|---|
| Input Price prompt tokens per 1M | $1.25 | $0.25 |
| Completion Price per 1M tokens | $1.25 | $2 |
| Sample Workload Cost 1M input + 500K output | $1.88 | $1.25 |
| Context Window | 128K | 400K |
| Release Date |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | GPT-5.1-Codex-Mini | On the standard 1M input plus 500K output workload, GPT-5.1-Codex-Mini is estimated at $1.25 vs $1.88 for Cogito v2.1 671B, saving $0.62 (33.3% lower). |
| High-volume input processing | GPT-5.1-Codex-Mini | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | Cogito v2.1 671B | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | GPT-5.1-Codex-Mini | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- gpt-oss-120b (free) can replace GPT-5.1-Codex-Mini when lower sample workload cost matters most: $0.
- gpt-oss-20b (free) can replace GPT-5.1-Codex-Mini when lower sample workload cost matters most: $0.
- gpt-oss-20b can replace GPT-5.1-Codex-Mini when lower sample workload cost matters most: $0.1.
- gpt-oss-120b can replace GPT-5.1-Codex-Mini when lower sample workload cost matters most: $0.13.
- Llama 4 Scout offers 10M context with $0.23 sample workload cost.
- Owl Alpha offers 1.05M context with $0 sample workload cost.
- DeepSeek V4 Flash offers 1.05M context with $0.2 sample workload cost.
- DeepSeek V4 Pro offers 1.05M context with $0.87 sample workload cost.
- DeepSeek V4 Flash · DeepSeek · #1
- Hy3 preview · Tencent · #2
- Claude Opus 4.7 · Anthropic · #3
- Claude Sonnet 4.6 · Anthropic · #4
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GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex