Prompts that actually work

DeepSeek V4 Flash 0731 at $0.14/$0.28/M is the cheapest capable agentic coding model after its July 31 official release. Terminal-Bench 82.7% (up from 61.8% preview) puts it within 0.6 points of Grok 4.5 at 14× the price difference. The model supports Responses API natively, runs in OpenCode, and is Codex-compatible — making it a drop-in for most OpenAI-based agent harnesses. These prompts are optimised for the DeepSeek API (model: deepseek-v4-flash) and self-hosted 0731 weights. Note: migrate from deepseek-chat and deepseek-reasoner before October 24, 2026.

DeepSeek V4 Pro at $0.44/M is the cheapest capable coding API available in July 2026 — 4× cheaper than Grok 4.5, 11× cheaper than Kimi K3. V4 Flash at $0.09/M is even cheaper for simpler tasks. The V4 family supports tool calling, function calling, and multi-turn coding sessions. Self-hostable via official weights under MIT license. For teams running extremely high-volume coding workloads where cost is the absolute primary constraint, DeepSeek V4 remains the lowest-cost capable option. These prompts are optimised for the DeepSeek API and self-hosted V4 Pro deployments.

DeepSeek V4 Pro at $0.44/$0.87/M (discounted) is the most cost-efficient coding model available in July 2026 — 7-17x cheaper than Western frontier alternatives. V4 Flash at $0.14/$0.28/M is ideal for high-volume routing and classification tasks. These prompts are optimised for the DeepSeek API and the Anthropic Messages endpoint (now available at api.deepseek.com/anthropic). Important: migrate your deepseek-chat alias to deepseek-v4-flash before July 24 at 15:59 UTC.

DeepSeek V4 Pro with thinking mode ON is one of the most cost-efficient models for research tasks that require extended reasoning — literature review synthesis, multi-step analysis, and structured comparison. At $0.44/$0.87/M (discounted), it delivers frontier-class reasoning at 7-17x lower cost than Western alternatives. Important: migrate from deepseek-chat to deepseek-v4-flash before July 24 at 15:59 UTC.

DeepSeek V4 Pro at $0.44/$0.87/M (discounted) is the most cost-efficient model for high-volume writing tasks in July 2026. V4 Flash at $0.14/$0.28/M works for simpler writing and content generation. With thinking mode ON by default, V4 Pro works through complex writing tasks — structure, argument, tone — before producing output. These prompts are optimised for the DeepSeek API post-July 24 migration.

DeepSeek is an order of magnitude cheaper than anything else at volume, which makes it the right tool for high-throughput work where per-token cost dominates rather than for one-off reasoning. These six are built for batch jobs. One thing to plan for: deepseek-chat and deepseek-reasoner are deprecated from 24 October 2026, so anything you build now needs a migration path.