Prompts that actually work

Kimi K3 ranks #1 globally on Design Arena frontend coding (1679 Elo) and #1 on SWE Marathon (42.0%) — making it the strongest available model for frontend development and long-horizon agentic coding tasks. At $3/$15/M with 1M context on Allegretto+ tier, it offers the best price-to-coding-capability ratio of any frontier model. These prompts are optimised for Kimi Code CLI, the Kimi API, and kimi.com on Allegretto+ or Vivace tiers.

Kimi K3 leads the SWE Marathon agentic coding benchmark at 42.0% and tops the Frontend Code Design Arena at 1679 Elo — the highest coding-specific rankings of any model in July 2026. At $3/$15/M ($0.30/M cached) with 1M context, K3 can ingest entire codebases in a single session. Open weights are live from July 27, 2026 at huggingface.co/moonshotai under Modified MIT license. Important: independent testing found a 51% hallucination rate not disclosed in Moonshot's benchmarks — test on factual/retrieval tasks before production deployment. These prompts are optimised for kimi.com Allegretto+/Vivace tiers, the Kimi API, and self-hosted K3 deployments.

Kimi K3's 1M context window on Allegretto+ tier makes it one of the strongest research models available — it can ingest entire research papers, technical documentation sets, and large code repositories in a single session. At $0.30/M cached input, repeated context (like a standing research brief or knowledge base) becomes extremely cost-efficient. These prompts are optimised for kimi.com on Allegretto+ or Vivace tiers and the Kimi API.

Kimi K3 on Allegretto+ tier offers 1M context for writing tasks that require deep document awareness — editing a long manuscript, maintaining style consistency across a large content set, or rewriting with full context of everything written before. At $0.30/M cached input, repeatedly referencing a style guide or brand voice document costs almost nothing. These prompts are optimised for kimi.com on Allegretto+ and the Kimi API.

Kimi K3 with 1M context on Allegretto+ is exceptional for long-form writing tasks — the model can hold an entire book manuscript, legal document, or content strategy in context while writing new sections. At $3/$15/M ($0.30/M cached), repeated long-context writing sessions are cost-efficient. These prompts are optimised for kimi.com on Allegretto+ or Vivace tiers.

K3 is available from Moderato at 19 dollars a month, and K2.6 stays free and unlimited in chat without drawing on credits. These six prompts are built around the things K3 handles differently from a general assistant: long-context repository work, agent planning, and structured extraction. Test them on the free tier first, then decide which tier you need.