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What GPT-5 Actually Is: A September 2026 Reality Check

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Artificial Intelligence

What GPT-5 Actually Is: A September 2026 Reality Check

GPT-5 was not announced today. It shipped on 7 August 2025, left ChatGPT in February 2026, and shuts down in the API on 11 December 2026. The benchmarks OpenAI actually published, why MMLU and HumanEval are the wrong numbers, current pricing, and honest criticism.

Umut Ertugan · September 10, 2026 · 19 min

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Artificial Intelligence

Claude Fable 5: Performance, Speed, Tokens, and Pricing

A practical guide to Claude Fable 5 covering performance benchmarks, response speed, context window, token pricing, and built-in security features for 2026.

Umut Ertugan· 13 min· 25