Cogito v2.1 671B is $28.75 cheaper per 1M input tokens (95.8% lower; 24x difference).
API cost decision in 10 seconds
GPT-5.5 Pro vs Cogito v2.1 671B
Pick Cogito v2.1 671B for lower cost; pick GPT-5.5 Pro only if the larger context window matters more.
Pricing data updated:
Prices normalized to USD per 1M tokens
Sample workload: 1M input + 500K output
Budget verdict
Pick Cogito v2.1 671B for lower cost; pick GPT-5.5 Pro only if the larger context window matters more.
On the standard 1M input plus 500K output workload, Cogito v2.1 671B is estimated at $1.88 vs $120 for GPT-5.5 Pro, saving $118.12 (98.4% lower).
Cost-first pickCogito v2.1 671B
Context-first pickGPT-5.5 Pro
Sample savings$118.1298.4%
10x traffic gap$1181.25
GPT-5.5 Pro has more context, but Cogito v2.1 671B saves $118.12 on the standard workload. At 10x that traffic, the same price gap is about $1181.25. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
Cogito v2.1 671B stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | GPT-5.5 Pro | Cogito v2.1 671B |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | Cogito v2.1 671B | $240 | $6.88 |
| Balanced workload | 1M input + 1M output | Cogito v2.1 671B | $210 | $2.5 |
| Output-heavy chatbot | 1M input + 5M output | Cogito v2.1 671B | $930 | $7.5 |
Cogito v2.1 671B is $178.75 cheaper per 1M output tokens (99.3% lower; 144x difference).
GPT-5.5 Pro has 922K more context (8.2x larger).
Cogito v2.1 671B is $118.12 cheaper on the standard workload (98.4% 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
Cogito v2.1 671B has the lower input price; Cogito v2.1 671B has the lower output price; GPT-5.5 Pro offers the larger context window. For the 1M input plus 500K output sample, Cogito v2.1 671B is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $120 for GPT-5.5 Pro and $1.88 for Cogito v2.1 671B.
Choose GPT-5.5 Pro when you care most about larger context window.
Choose Cogito v2.1 671B when you care most about lower input-token price, and lower output-token price.
- On the standard 1M input plus 500K output workload, Cogito v2.1 671B is estimated at $1.88 vs $120 for GPT-5.5 Pro, saving $118.12 (98.4% lower).
- Cogito v2.1 671B is $118.12 cheaper on the standard workload (98.4% lower).
- Cogito v2.1 671B is $28.75 cheaper per 1M input tokens (95.8% lower; 24x difference).
- Cogito v2.1 671B is $178.75 cheaper per 1M output tokens (99.3% lower; 144x difference).
- GPT-5.5 Pro has 922K more context (8.2x larger).
| Feature | GPT-5.5 Pro (OpenAI) | Cogito v2.1 671B (Deep Cogito) |
|---|---|---|
| Input Price prompt tokens per 1M | $30 | $1.25 |
| Completion Price per 1M tokens | $180 | $1.25 |
| Sample Workload Cost 1M input + 500K output | $120 | $1.88 |
| Context Window | 1.05M | 128K |
| Release Date |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | Cogito v2.1 671B | On the standard 1M input plus 500K output workload, Cogito v2.1 671B is estimated at $1.88 vs $120 for GPT-5.5 Pro, saving $118.12 (98.4% lower). |
| High-volume input processing | Cogito v2.1 671B | 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-5.5 Pro | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- gpt-oss-120b (free) can replace GPT-5.5 Pro when lower sample workload cost matters most: $0.
- gpt-oss-20b (free) can replace GPT-5.5 Pro when lower sample workload cost matters most: $0.
- gpt-oss-20b can replace GPT-5.5 Pro when lower sample workload cost matters most: $0.1.
- gpt-oss-120b can replace GPT-5.5 Pro when lower sample workload cost matters most: $0.13.
- Llama 4 Scout offers 10M context with $0.23 sample workload cost.
- Grok 4.20 Multi-Agent offers 2M context with $5 sample workload cost.
- Grok 4.20 offers 2M context with $2.5 sample workload cost.
- No popular competitor is currently available.
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