Observed Signal · Sep 16, 2026 · Deprecation · Source: onlinemarketing.de · Impact: 4/5 · Sentiment: Neutral
OpenAI Retires GPT-5.5 from ChatGPT and Codex
OpenAI is discontinuing its GPT-5.5 model in consumer and work-focused platforms, including ChatGPT, ChatGPT Work, and Codex. Starting October 14, users will no longer be able to select GPT-5.5 in these interfaces, as the company pushes adoption of its newer models, particularly GPT-6 Astra, which is positioned as the 'world's most intelligent model' and GPT-5.6 Sol. Developers will retain access to GPT-5.5 through the OpenAI API platform and in Codex sessions authenticated with API keys. This move is part of OpenAI's pattern of retiring older models to streamline offerings and encourage migration to newer, more expensive models. The article notes pricing for GPT-6 Astra at $10 per million input tokens and $50 per million output tokens, compared to GPT-5.5's $5 and $30 respectively. Additional context mentions new features like a Data Agent in ChatGPT Work and the AI Agent Work learning user writing styles.
OpenAI's retirement of GPT-5.5 from consumer platforms is a significant policy update from a major AI player, affecting developers and users in the AdTech/MarTech ecosystem who rely on OpenAI's models for automation and content generation.
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Key Takeaways & Evidence Grounding
- OpenAI will remove GPT-5.5 from ChatGPT, ChatGPT Work, and Codex starting October 14, 2026.
- Developers will still have access to GPT-5.5 via the OpenAI API platform.
- GPT-6 Astra is priced at $10 per million input tokens and $50 per million output tokens.
- GPT-5.5 was priced at $5 per million input tokens and $30 per million output tokens.
- GPT-5.5 was introduced in April 2026, followed by GPT-5.6 in June, and GPT-6 Astra in September 2026.
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OpenAI launches GPT‑5.6 family, ChatGPT Work
OpenAI released the GPT‑5.6 family and on the same day consolidated its product lineup into a single desktop app that combines chat, a long-running agent (ChatGPT Work), and coding views. Standalone Codex was retired and the Atlas browser is being phased out as OpenAI folds agentic and coding capabilities into one console that can access local files and drive desktop workflows. The newsletter also reports related industry moves: Meta’s Mark Zuckerberg promoted Muse Spark 1.1 on X to launch Meta’s agentic coding model, Google rolled out a buried “created or edited with AI” disclosure for ads across Search, Discover and YouTube, and market notes flagged quant funds’ recent losses tied to AI chip trades. The piece frames these as signs of platform consolidation and shifting distribution dynamics for AI models and tools.
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