Claude Opus 5 vs DeepSeek V4 Pro
Facts only. This page does not pick a winner. For a picked winner, see the use case comparison on Tools.
| Claude Opus 5 | DeepSeek V4 Pro | |
|---|---|---|
| API model IDs | claude-opus-5 | deepseek-v4-pro, deepseek-v4-pro-0813 |
| Context window | 1,000,000 | 1,000,000 |
| Lifecycle | active | active |
| License | proprietary | open-weights |
| Trains on API data | No | Yes |
| Zero data retention | on-request | no |
| Input per 1M tokens | $5 (verified 2026-09-08) | $1.32 (verified 2026-09-08) |
Frequently asked questions
- Which has the larger context window, Claude Opus 5 or DeepSeek V4 Pro?
- Claude Opus 5 holds 1,000,000 tokens and DeepSeek V4 Pro holds 1,000,000. Both hold 1,000,000 tokens. The context window counts the prompt, any attached files, and the reply together.
- Which is cheaper, Claude Opus 5 or DeepSeek V4 Pro?
- Per million input tokens, Claude Opus 5 was $5 (verified 2026-09-08) and DeepSeek V4 Pro was $1.32 (verified 2026-09-08). DeepSeek V4 Pro is cheaper per input token. Output tokens cost $25 and $3.96 respectively, and output volume usually decides the bill.
- Does Claude Opus 5 or DeepSeek V4 Pro train on API data?
- Claude Opus 5 does not train on API data by default, and DeepSeek V4 Pro trains on API data by default. Zero data retention is on-request for Claude Opus 5 and no for DeepSeek V4 Pro. Verified 2026-09-08 and 2026-09-08 against the providers' own documentation.
- Is Claude Opus 5 or DeepSeek V4 Pro being retired?
- Claude Opus 5 is active. DeepSeek V4 Pro is active. Lifecycle checked 2026-09-08 and 2026-09-08. Pin a dated snapshot ID rather than an alias if a retirement would break you.