Why Codex Was Told Not to Mention Goblins
Discover why the Codex system prompt leak matters, what the goblin rule signals about AI control, and how hidden prompts really work. Read on.
Writing about the craft of prompting, the shape of agents, and the small engineering decisions that make models useful in real work.
Discover why the Codex system prompt leak matters, what the goblin rule signals about AI control, and how hidden prompts really work. Read on.
Learn how to choose GPT-5.5 Instant, Pro, or Thinking with a simple decision matrix for speed, cost, and complexity. See examples inside.
ai toolsDiscover why GPT-5.5 Codex token efficiency matters more than raw pricing, and how fewer tokens can lower real coding costs. Read the full guide.
prompt engineeringDiscover how Moonshot pushed Kimi from top open-source to GPT-5.5-level performance in 18 months, and what that means for AI teams. Read on.
ai toolsLearn how to choose between deepseek-chat aliases and explicit V4 models before July deprecation hits production. Read the full guide.
ai toolsDiscover why DeepSeek V4 Flash costs 25x less than Pro yet gives up just 1.6 SWE-Bench points. Learn the tradeoffs and when to use it. Try free.
ai toolsLearn how to fix the DeepSeek V4 reasoning_content 400 error during migration, especially in multi-turn tool chats. See examples inside.
tutorialsDiscover why Mistral, Kimi, and Qwen are drifting from Apache 2.0 to modified MIT-style licenses, and what that means for builders. Read on.
ai newsDiscover what Mistral Medium 3.5, Devstral 2, and Magistral reveal about model consolidation, tradeoffs, and product strategy. Read the full guide.
ai toolsLearn how to write better prompts for Mistral Medium 3.5 and why its merged 128B design changes prompting for coding and reasoning. Try free.
prompt tipsDiscover why cost per completed task is a better AI metric than cost per token in 2026, with research-backed examples and practical guidance. Try free.
prompt engineeringLearn why AI routing is now core infrastructure, not optional plumbing, and how multi-model gateways cut cost, latency, and risk. Read the full guide.
prompt engineering