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DeepSeek-V4-Pro vs GPT-6.1 Sol: Price, Context, Access
DeepSeek-V4-Pro is DeepSeek's largest model, a 1.6T-parameter mixture-of-experts with open MIT-licensed weights and a 1M-token context. GPT-6.1 Sol is OpenAI's closed mid-tier model, which accepts images as well as text and aims for near GPT-6 Astra results on coding and professional work.
The short answer
Pick DeepSeek-V4-Pro if you want open weights, lower token prices and a free chat app for text-only reasoning and coding. Pick GPT-6.1 Sol if you need image input, OpenAI's tooling such as Codex and ChatGPT Work, or an ultrafast speed tier.
Side by sideDeepSeek-V4-Pro vs GPT-6.1 Sol
| DeepSeek-V4-Pro | GPT-6.1 Sol | |
|---|---|---|
| Provider | DeepSeek | OpenAI |
| Released | Apr 24, 2026 | Sep 29, 2026 |
| Context window | 1M | 1.05M |
| API price | deepseek-v4-pro per 1M tokens: input cache hit $0.022 off-peak / $0.044 peak; input cache miss $0.66 off-peak / $1.32 peak; output $1.98 off-peak / $3.96 peak | $2 / 1M input tokens, $0.10 / 1M cached input tokens, $10 / 1M output tokens |
| Open weights | Yes | No |
| Consumer access | Available in the DeepSeek app and on the web (chat.deepseek.com), free to use | ChatGPT Work and Codex for Plus, Pro, Business, Enterprise and Edu at launch (not initially in the standard Chat mode) |
| Best for | Hard reasoning, coding and agentic tasks at a fraction of US frontier-model prices. | Complex coding, computer use and professional tasks you want near-Astra quality on at about one-fifth of Astra's token price. |
Facts in this table come from the verified profile of each product.
Key differences
Per 1M tokens: cache-miss input $0.66 off-peak / $1.32 peak; output $1.98 off-peak / $3.96 peak.
$2 / 1M input tokens, $0.10 / 1M cached input tokens, $10 / 1M output tokens.
1M tokens.
1.05M tokens (922K max input, 128K max output).
Open, MIT-licensed; published weights are the April preview, not the current 0813 version.
Closed; available only through OpenAI.
Text in, text out; no image input.
Text and image in, text out.
SWE Verified 80.6, GPQA Diamond 90.1, Terminal Bench 2.1 87.9, HLE with tools 60.0.
DeepSWE v1.1 75.2%, OSWorld 2.0 71.4%, AutomationBench 31.7% (OpenAI-reported).
Free in the DeepSeek app and on the web.
ChatGPT Work and Codex for Plus, Pro, Business, Enterprise and Edu; not initially in standard Chat.
Text only; peak-hour API prices are double off-peak.
Tool calling requires the Responses API; some developers report over-refusals on allowed tasks.
Choose DeepSeek-V4-Pro if…
- You want open weights you can download under the MIT license.
- You want lower per-token API prices, especially off-peak.
- Your work is text-only reasoning, coding or agent tasks.
- You want an API compatible with OpenAI and Anthropic formats.
Choose GPT-6.1 Sol if…
- You need image input as well as text.
- You already use Codex or ChatGPT Work on a paid plan.
- You want an ultrafast speed tier in the API.
- You need up to 128K output tokens per response.
Frequently asked questions
Is DeepSeek-V4-Pro cheaper than GPT-6.1 Sol?
Yes, on listed API prices. DeepSeek-V4-Pro costs $0.66 off-peak or $1.32 peak per 1M cache-miss input tokens and $1.98 or $3.96 per 1M output tokens. GPT-6.1 Sol costs $2 per 1M input tokens and $10 per 1M output tokens.
Which has the larger context window?
They are close. GPT-6.1 Sol lists 1.05M tokens, with up to 922K input and 128K output. DeepSeek-V4-Pro lists a 1M-token context.
Can I compare their benchmark scores directly?
Not directly. The two records report different tests: DeepSeek-V4-Pro lists SWE Verified, GPQA Diamond, Terminal Bench 2.1 and HLE with tools, while GPT-6.1 Sol lists OpenAI-reported DeepSWE v1.1, OSWorld 2.0 and AutomationBench scores.
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