DeepSeek V3 / R1by DeepSeek AI
DeepSeek Prompt Generator
Write prompts that maximise DeepSeek's exceptional coding ability and reasoning performance.
DeepSeek V3 matches GPT-4o on coding benchmarks at a fraction of the API cost, making it the most cost-efficient choice for technical prompts. DeepSeek R1 uses chain-of-thought reasoning that shows its work step by step — ideal for math, logic, and debugging tasks.
DeepSeek V3 matches GPT-4o on HumanEval coding benchmarkDeepSeek R1 rivals OpenAI o1 on reasoning benchmarksAPI cost: ~95% cheaper than GPT-4o per token
Source: Official DeepSeek prompting guide →
DeepSeek V3 and R1 are the most cost-effective high-performance AI models available in 2026 — matching GPT-4o on coding benchmarks and rivalling o1 on reasoning tasks at a fraction of the API cost. DeepSeek responds best to structured, technical prompts with clear step-by-step requirements. PromptItIn optimises your prompts to get o1-level reasoning and GPT-4o-level code quality from DeepSeek's API.
What makes a great DeepSeek prompt?
1Use DeepSeek R1 specifically for reasoning-heavy tasks — it uses chain-of-thought processing that shows its work step by step
2DeepSeek V3 performs exceptionally on coding benchmarks — provide code context, error messages, and language version for best results
3DeepSeek is extremely token-efficient — detailed, well-structured prompts don't cost significantly more but produce far better outputs
4For API use, system prompts are highly effective at setting output format, language, and behaviour for entire sessions
Before & after: how PromptItIn improves your DeepSeek prompts
Added language version, framework, full error context, code, and sample data — giving DeepSeek everything it needs for precise debugging rather than generic advice.
✓ PromptItIn-optimised
Language: Python 3.11. Framework: FastAPI. Problem: I'm getting a 422 Unprocessable Entity error on a POST endpoint when the request body contains nested JSON. Here is the exact error message: [paste error]. Here is the relevant endpoint code: [paste code]. Here is a sample request body that triggers the error: [paste JSON]. Please: 1. Identify the root cause. 2. Explain why this error occurs in FastAPI. 3. Provide a corrected version of the endpoint with inline comments explaining the fix. 4. Add a note about any edge cases I should handle.
Ready-to-use DeepSeek prompt starters
Code Debugging
Language: [language + version]. Framework: [framework]. Error: [paste exact error]. Code: [paste code]. Fix the bug and explain the root cause. Add comments to the corrected code.
Algorithm Design
Design an algorithm to [problem description]. Constraints: [time/space complexity requirements]. Language: [language]. Provide: pseudocode, implementation, time complexity analysis, and test cases.
Advanced Reasoning
[R1 mode] Think step by step through this problem: [complex problem]. Break down your reasoning into numbered steps. Show your work at each stage. Arrive at a final answer with a confidence assessment.
API Integration
Write [language] code to integrate with the [API name] API. Task: [specific endpoint/action]. Auth method: [auth type]. Return format: [JSON/other]. Include error handling for [specific errors]. Add usage example.
DeepSeek prompting tips
→Specify language version and framework — DeepSeek's coding quality is highest when given precise technical context
→For DeepSeek R1, use 'Think step by step' or 'Reason through this carefully' to activate chain-of-thought processing
→Paste full error messages and relevant code — DeepSeek V3 can process long technical contexts without quality degradation
→For API prompts, define the output format explicitly (JSON schema, function signature) — DeepSeek follows structured output specs very reliably
Stop writing weak DeepSeek prompts
PromptItIn analyses your rough idea and builds a complete, structured prompt with role, context, constraints, and format — ready to paste into DeepSeek in seconds.
✦ Try PromptItIn free — no card needed