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Models2026-07-30 · source-backed
Alongside the July 29 launch of ChatGPT for Academic Researchers, free GPT-5.6 Sol Pro for 10,000 researchers this summer scaling to 100,000 through 2027 backed by over $250 million, OpenAI disclosed efficiency work on the harness underlying Codex and ChatGPT Work: 54% fewer output tokens than Claude Fable 5 on coding benchmarks, 80% cheaper operation on the lighter GPT-5.5 Luna, and a 15% efficiency gain after GPT-5.6 rewrote OpenAI's own production kernels via Codex. The two announcements are coupled. Cheaper inference is what makes giving the model away at this scale viable.
Each link below shares sources, entities, or timing with this story.
ChatGPT built by OpenAI / Shared entities / Same source domain / Shared topic / Earlier coverage
Linked by a graph relationship (ChatGPT built by OpenAI); both cover ChatGPT, Claude Fable, Codex, GPT; reported by the same outlet (openai.com).
ChatGPT built by OpenAI / Shared entities / Same source domain / Shared topic
Linked by a graph relationship (ChatGPT built by OpenAI); both cover Claude Fable, Codex, GPT, July; reported by the same outlet (openai.com).
ChatGPT built by OpenAI / Shared entities / Same source domain / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (ChatGPT built by OpenAI); both cover ChatGPT, Codex, GPT, OpenAI; reported by the same outlet (openai.com).
ChatGPT built by OpenAI / Shared entities / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (ChatGPT built by OpenAI); both cover ChatGPT, Codex, GPT, July; overlapping topics (codex, gpt-5).
ChatGPT built by OpenAI / Shared entities / Same source domain / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (ChatGPT built by OpenAI); both cover Codex, GPT, OpenAI; reported by the same outlet (openai.com).
ChatGPT built by OpenAI / Shared entities / Same source domain / Shared topic / Earlier coverage
Linked by a graph relationship (ChatGPT built by OpenAI); both cover GPT, Luna, OpenAI; reported by the same outlet (openai.com).
Linked by a graph relationship (ChatGPT built by OpenAI); both cover Codex, GPT, OpenAI; reported by the same outlet (openai.com).
ChatGPT built by OpenAI / Shared entities / Shared topic / Earlier coverage
Linked by a graph relationship (ChatGPT built by OpenAI); both cover Codex, GPT, July, OpenAI; overlapping topics (codex, openai, token).