A systems-grade field manual for choosing the right model, dialing the right reasoning level, and deploying reliable agentic workflows, written for the GPT-5 family.
Series
Guide 1 of 4
Format
PDF • 7 pages
Focus
AI Model Mastery
Read the full guide.
OpenAI's GPT-5 family changed the operating model. The real advantage is no longer better prompts in isolation; it is knowing when to route work into Instant, Thinking, or Pro reasoning.
This guide translates the GPT-5 product line into practical operating rules so teams can choose the right model, control compute cost, and keep high-stakes work reliable.
Edition note, checked October 23, 2026: this PDF was written on March 12, 2026 for the GPT-5 family. OpenAI retired GPT-5.5 from ChatGPT, ChatGPT Work, and Codex on October 14, 2026, ChatGPT now runs GPT-6 models, and OpenAI's current API lineup is GPT-6 Astra, GPT-6.1 Sol, and GPT-6 Luna. The routing method and the Reasoning Escalation Ladder still apply; the model names and API strings in the PDF are dated. For current models and prices, use the AI Models hub at /models.
The T-Minus AI Axiom
The cost of AI is no longer tokens. It is the time you pay for a thought. Master the routing, not just the prompt.
Proof Section
Who This Is For
What's Inside
Preview Excerpts
Slide 1 of 3
See the full GPT-5 lineup, release timeline, and best-fit task mapping.
Inside The Guide
Breaks down GPT-5, mini, nano, 5.1, 5.2, and 5.2-Codex with release dates, API strings, and best-fit work categories.
Explains Instant, Thinking, and Pro modes plus the reasoning escalation ladder so you stop overpaying for unnecessary model effort.
Includes blueprint patterns for autonomous research pipelines and code review agents, then closes with the main failure modes you will actually hit.
Why This Guide Is Worth It
Module 01
Breaks down GPT-5, mini, nano, 5.1, 5.2, and 5.2-Codex with release dates, API strings, and best-fit work categories.
Module 02
Explains Instant, Thinking, and Pro modes plus the reasoning escalation ladder so you stop overpaying for unnecessary model effort.
Module 03
Includes blueprint patterns for autonomous research pipelines and code review agents, then closes with the main failure modes you will actually hit.
Download
TminusAI_Guide_1_GPT5_Intelligence_Playbook.pdf
PDF • 7 pages • 19 KB
7-page PDF with model routing tables, execution-mode rules, agentic workflow blueprints, and a final quick-reference cheat sheet.
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