AllocateCogito v2.1 671B vs GPT-5.5
Cogito v2.1 671B is not currently in the Allocate serving catalog, so this page lists no prices for it: every price on this site comes from the live catalog.
C Cogito v2.1 671B
GPT-5.5
GPT-5.5LabDeep CogitoOpenAI
AccessNot served on AllocateAPI only
Context windown/a400K tokens
List price, inputNot served$5 / M tokens
List price, outputNot served$30 / M tokens
Cached inputn/a$0.5 / M tokens
LicenseNot listedProprietary API
Fine-tunableYesNo
Specifications and provider list prices from the Allocate catalog, checked 2026-09-12.
Choose Cogito v2.1 671B for
- Long reasoning chains
- Open-weight agents
- Self-hosted reasoning
Common questions
Which has the bigger context window?
GPT-5.5: 400,000 tokens (400K) against an unlisted window for Cogito v2.1 671B.
Can I fine-tune Cogito v2.1 671B or GPT-5.5?
Cogito v2.1 671B publishes open weights (Not listed) and can be fine-tuned on your own data. GPT-5.5 is a closed model served over API; its weights are not available.
Related comparisons
Cogito v2.1 671B vs OpenAI GPT-OSS 120BGPT-5.5 vs OpenAI GPT-OSS 120BCogito v2.1 671B vs OpenAI GPT-OSS 20BGPT-5.5 vs OpenAI GPT-OSS 20BCogito v2.1 671B vs Gemini 3.1 ProGPT-5.5 vs Gemini 3.1 Pro
Run the numbers on your workload
Or do not choose. On Allocate a route name is the contract: point yours at one model today, swap to the other tomorrow, and compare them on your live traffic with per-token metering.