DeepSeek V4 Pro vs GPT-5.1
DeepSeek V4 Pro vs GPT-5.1: DeepSeek V4 Pro is cheaper for input-heavy usage ($0.435/M vs $1.25/M input tokens), while DeepSeek V4 Pro is better for long-context tasks (1,000,000 tokens).
Direct answer: choose DeepSeek V4 Pro for lower token spend and choose DeepSeek V4 Pro when your workload needs longer context.
Common pricing searches covered on this page: DeepSeek V4 Pro vs GPT-5.1 • DeepSeek V4 Pro vs GPT-5.1 pricing • DeepSeek V4 Pro vs GPT-5.1 API pricing and v4 pro vs 5 1 pricing.
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
DeepSeek V4 Pro
GPT-5.1
Cost Differences
GPT-5.1 costs more than DeepSeek V4 Pro
Quick Recommendation
Winner for direct API pricing: DeepSeek V4 Pro. At the default workload, DeepSeek V4 Pro saves about $16.14/month ($196.37/year) versus GPT-5.1.
Feature Comparison
| Feature | DeepSeek V4 Pro | GPT-5.1 |
|---|---|---|
| Provider | DeepSeek | OpenAI |
| Input Price | $0.435/1M tokens | $1.25/1M tokens |
| Output Price | $0.87/1M tokens | $10.00/1M tokens |
| Context Window | 1,000,000 tokens | 1,000,000 tokens |
| Max Output | 384,000 tokens | 131,072 tokens |
| Category | flagship | flagship |
| Capabilities | textcodereasoning | textvisionaudiocodereasoning |
| Release Date | 4/24/2026 | 11/12/2025 |
DeepSeek V4 Pro vs GPT-5.1: Which Should You Choose?
Choosing between DeepSeek V4 Pro and GPT-5.1 depends on your priorities: cost efficiency, context length, or raw capability. DeepSeek V4 Pro is the more affordable option at $0.435/1M input tokens — 65% cheaper than GPT-5.1.
These models come from different providers — DeepSeek and OpenAI — which means different API ecosystems, SDKs, rate limits, and terms of service. If you're already integrated with DeepSeek, switching to OpenAIinvolves migration effort beyond just pricing. Factor in your existing infrastructure when deciding.
Both models are in the flagship category, making this a direct head-to-head comparison. At scale — say 10,000 requests per day — the cost difference adds up: DeepSeek V4 Pro would save you roughly $1,614.00/month compared to GPT-5.1. For startups and indie developers, that difference can be significant.
Output costs matter too. DeepSeek V4 Pro charges $0.87/1M output tokens vs $10.00 for GPT-5.1. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. DeepSeek V4 Pro has the edge here at $0.87/1M output tokens.
Multimodal capabilities: GPT-5.1 supports vision (image inputs) while DeepSeek V4 Pro is text-only. If your application needs image understanding, this narrows your choice.
Best Use Cases
Choose DeepSeek V4 Pro when:
- • Budget is a primary concern
- • You need longer outputs (up to 384,000 tokens)
- • You're already using DeepSeek's API ecosystem
Choose GPT-5.1 when:
- • You need more capabilities (vision, audio)
- • You're already using OpenAI's API ecosystem
Pros and Caveats at a Glance
DeepSeek V4 Pro
- • Input pricing: $0.435/M tokens
- • Output pricing: $0.87/M tokens
- • Context window: 1,000,000 tokens
- • Max output: 384,000 tokens
Watch out for
- • Trade-offs are minor in this matchup.
GPT-5.1
- • Input pricing: $1.25/M tokens
- • Output pricing: $10.00/M tokens
- • Context window: 1,000,000 tokens
- • Max output: 131,072 tokens
Watch out for
- • Higher input cost than DeepSeek V4 Pro
- • Higher output cost than DeepSeek V4 Pro
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
DeepSeek V4 Pro (DeepSeek)
GPT-5.1 (OpenAI)
Start using DeepSeek V4 Pro today
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Sign Up for OpenAI →Frequently Asked Questions
Which is cheaper, DeepSeek V4 Pro or GPT-5.1?▼
What is the context window difference between DeepSeek V4 Pro and GPT-5.1?▼
Which model is better for AI Agent / Agentic Workflows?▼
Which model has better overall pricing for heavy usage?▼
Where can I compare DeepSeek and OpenAI API pricing beyond this model matchup?▼
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