Head to head
DeepSeek V4 Pro vs GPT-6 Sol
DeepSeek V4 Pro (DeepSeek) and GPT-6 Sol (OpenAI) compared on intelligence, speed, context, and price — and which to choose. Both run on just4o.chat from one chat.
| Metric | DeepSeek V4 Pro | GPT-6 Sol |
|---|---|---|
| Intelligence (AA index) | 44 | — |
| Output speed (tokens/sec) | 88.2 | — |
| Context window | 1.0M | 1.1M ✓ |
| Max output | 384K ✓ | 128K |
| Input price / 1M | $0.435 ✓ | $2 |
| Output price / 1M | $0.87 ✓ | $10 |
| Released | 2026-08-13 | 2026-09-22 |
Choose DeepSeek V4 Pro if you want…
- Lower price ($0.54 / 1M blended)
Choose GPT-6 Sol if you want…
- Larger context window (1.1M)
DeepSeek V4 Pro
DeepSeek V4 Pro makes a compelling case that frontier-class coding performance and a one-million-token context window do not have to cost frontier-class money. The official 0813 release supersedes the preview, adding a DSpark speculative-decoding module and stronger agentic performance in production. On just4o.chat it runs via Fireworks serverless as deepseek-v4-pro-0813. Users consistently praise its agentic coding ability, noting it competes with or beats larger closed models on multi-step coding tasks, and its hybrid attention architecture handles full-codebase analysis without collapsing under the token budget. The MIT license is a genuine differentiator: weights are freely available for self-hosting, fine-tuning, and commercial integration. The honest caveat: V4 Pro is verbose. It can generate four to five times more output tokens than comparable models on the same prompt, which erodes the per-token savings and makes cost estimation harder than it first appears.
Full DeepSeek V4 Pro details →FAQ
Which is better, DeepSeek V4 Pro or GPT-6 Sol?
DeepSeek V4 Pro leads on 1 of the headline metrics (lower price ($0.54 / 1m blended)), while GPT-6 Sol wins on larger context window (1.1m). The right pick depends on whether you prioritise capability, speed, or cost.
Is DeepSeek V4 Pro or GPT-6 Sol cheaper?
DeepSeek V4 Pro is cheaper at $0.54 per 1M tokens (blended), versus $4.
Can I use both DeepSeek V4 Pro and GPT-6 Sol?
Yes. Both are available on just4o.chat from a single chat — you can switch between them per message with no separate subscriptions.