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OpenAI's GPT-5.5 integrates coding, offers new prompting guidance

OpenAI has released GPT-5.5, integrating its coding capabilities directly into the main model and enhancing agentic performance on computer tasks. The company advises users to treat GPT-5.5 as a new model family, recommending a fresh approach to prompt engineering rather than simply adapting existing prompts. New features include adjustable verbosity and image detail levels, with models now supporting asynchronous operations. AI

Summary written by gemini-2.5-flash-lite from 4 sources. How we write summaries →

IMPACT New prompting strategies and integrated coding capabilities in GPT-5.5 may accelerate agent development and require prompt re-optimization.

RANK_REASON Frontier-lab model release with system card

Read on Simon Willison →

COVERAGE [4]

  1. Simon Willison TIER_1 ·

    Quoting OpenAI Codex base_instructions

    <blockquote cite="https://github.com/openai/codex/blob/66b0781502be5de3b1909525c987643b9e5e407d/codex-rs/models-manager/models.json#L55"><p><code>Never talk about goblins, gremlins, raccoons, trolls, ogres, pigeons, or other animals or creatures unless it is absolutely and unambi…

  2. Simon Willison TIER_1 ·

    Quoting Romain Huet

    <blockquote cite="https://twitter.com/romainhuet/status/2047955381578838357"><p>Since GPT-5.4, we’ve unified Codex and the main model into a single system, so there’s no separate coding line anymore.</p> <p>GPT-5.5 takes this further, with strong gains in agentic coding, computer…

  3. Simon Willison TIER_1 ·

    GPT-5.5 prompting guide

    <p><strong><a href="https://developers.openai.com/api/docs/guides/prompt-guidance?model=gpt-5.5">GPT-5.5 prompting guide</a></strong></p> Now that GPT-5.5 is <a href="https://developers.openai.com/api/docs/models/gpt-5.5">available in the API</a>, OpenAI have released a wealth of…

  4. Simon Willison TIER_1 ·

    llm 0.31

    <p><strong>Release:</strong> <a href="https://github.com/simonw/llm/releases/tag/0.31">llm 0.31</a></p> <blockquote> <ul> <li>New GPT-5.5 OpenAI model: <code>llm -m gpt-5.5</code>. <a href="https://github.com/simonw/llm/issues/1418">#1418</a></li> <li>New option to set the <a hre…