# Cogito v2.1 671B vs Claude Sonnet 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.

## Specifications

| | Cogito v2.1 671B | Claude Sonnet 5 |
| --- | --- | --- |
| Lab | Deep Cogito | Anthropic |
| Access | Not served on Allocate | API only |
| Context window | n/a | 1M tokens |
| List price, input | Not served | $2 / M tokens |
| List price, output | Not served | $10 / M tokens |
| Cached input | n/a | $0.20 / M tokens |
| License | Not listed | Proprietary API |
| Fine-tunable | Yes | No |

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

## Choose Claude Sonnet 5 for

- Judgment calls with policy context
- Customer-facing writing
- Review and escalation flows

## Common questions

### Which has the bigger context window?

Claude Sonnet 5: 1,000,000 tokens (1M) against an unlisted window for Cogito v2.1 671B.

### Can I fine-tune Cogito v2.1 671B or Claude Sonnet 5?

Cogito v2.1 671B publishes open weights (Not listed) and can be fine-tuned on your own data. Claude Sonnet 5 is a closed model served over API; its weights are not available.

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[HTML page](https://allocate.network/compare/deepcogito-cogito-v2-1-671b-vs-sonnet-5) · [Cogito v2.1 671B](https://allocate.network/models/deepcogito-cogito-v2-1-671b.md) · [Claude Sonnet 5](https://allocate.network/models/sonnet-5.md) · [Machine-readable catalog](https://allocate.network/catalog.json)