GPT-5 Pro
AdoptTools
A high-capability OpenAI model variant used for advanced reasoning and analysis.
Why it's here
Placed in Adopt: 40 article(s) of evidence from 4 source(s), led by research-stage coverage, with 13 in the last 30 days. Confidence 96%.
Evidence (17)
- 4Simon Willison·8/7/2026product_launchCodex Builds a Better Raccoon Heist Game with GPT-5.6 Sol Ultra
Simon Willison compared the same one-shot game prompt across different coding agents and found Codex Desktop running GPT-5.6 Sol Ultra produced a more compelling Raccoon Heist game than a previous Claude Fable 5 attempt. The post also notes a visible bug in the generated game, which was later fixed with a follow-up prompt, and includes the full Codex transcript plus repository assets generated during the session.
- 6Hacker News·7/24/2026researchOpus 5 Tops Artificial Analysis Intelligence Leaderboard
Artificial Analysis reports Claude Opus 5 as the highest-scoring model on its Intelligence leaderboard, with Opus 5 variants ranked ahead of other leading systems such as Claude Fable 5 and GPT-5.6 Sol. The page compares models across intelligence, speed, latency, price, and context window using its multi-evaluation methodology.
- 8Hacker News·7/20/2026researchResearcher Finds WordPress RCE Using GPT-5.6 and $25
A security researcher says they discovered a WordPress remote code execution vulnerability and submitted it to exploit brokers, who reportedly pay up to $500,000 for such findings. The work was done with help from GPT-5.6 and about $25 in API spend, highlighting the use of AI tools in vulnerability research.
- 7The New Stack·7/18/2026model_releaseKimi K3 Compared Favorably with Claude in Coding Work
The post argues that Kimi K3, an open model from Moonshot AI, performs similarly to Claude on coding tasks while using comparable token counts and costing much less through both API and subscription pricing. It also claims that open or less-restricted models such as GLM 5.2 and Kimi K3 are becoming more competitive than gated U.S. models for practical developer workloads.
- 8Hacker News·7/18/2026researchGPT-5.6 reportedly helps close a 30-year convex optimization gap
A Hacker News-posted discussion highlights a reported result where GPT-5.6 was used with a prompt to help address a long-standing open problem in convex optimization. The item appears to concern an AI-assisted mathematical proof or derivation rather than a product release.
- 5Hacker News·7/18/2026researchFable 5 Outperforms GPT-5.6 Sol on an NP-Hard Optimization Benchmark
A benchmark comparison on an unpublished fiber-network optimization problem found Claude Fable 5 to be the strongest model overall, with more consistent results than GPT-5.6 Sol. The report also suggests the native /goal mode is not a universal performance boost: it sometimes improves results, but often changes the search path in ways that can also hurt outcomes.
- 7The New Stack·7/18/2026model_releaseClaude Fable 5 added permanently to subscription plans
Anthropic says Claude Fable 5 will be included in all Max and Team Premium plans starting July 20, at 50% of usage limits. Pro and Team Standard users will still access it through usage credits and will receive a one-time $100 credit. The change reverses a planned move to remove the model from subscriptions, likely in response to competitive pressure and user demand.
- 5Hacker News·7/16/2026researchClaude Fable 5 and GPT-5.6 Sol build AI music videos on a budget
A Hacker News post describes an open-source harness that lets frontier models autonomously research, generate, watch, and edit a full music video within a fixed budget. The experiment compared Claude Fable 5 and GPT-5.6 Sol at $25 and $100, logging tool use, costs, and output quality across four runs that all completed successfully.
- 7Simon Willison·7/16/2026securityCodex bug can delete files in full access mode
Simon Willison cites Thibault Sottiaux on a Codex bug that can unexpectedly delete files. The issue appears most often when full access mode is used without sandboxing or auto review, and when the model mistakenly deletes the $HOME directory after trying to override it for a temporary directory.
- 8Hacker News·7/15/2026researchStar Fleet Claims 20 Erdős Problem Solutions in Parallel
Star Fleet, a Lean 4-based AI math system, claims it solved 20 Erdős problems using up to 20 parallel agent harnesses, each running a separate GPT-5.6 instance. The setup combines large-scale compute, theorem search, proof verification, and long-term dependency tracking to tackle open mathematics problems.
- 3Simon Willison·7/14/2026open_sourceSimon Willison’s custom Codex Desktop pet, Pedalican
Simon Willison describes creating a custom Codex Desktop pet: a pelican riding a bicycle that animates on his desktop and reports on Codex tasks. He also details how GPT-5.6 Sol, along with multiple rounds of gpt-image-2, generated the sprite assets and notes that the implementation relies on open-source skills from OpenAI.
- 8The New Stack·7/14/2026product_launchOpenAI Codex reaches 8 million users after ChatGPT integration
OpenAI says combined usage of Codex and ChatGPT Work may have reached 8 million users after the launch of GPT-5.6 and the unification of Codex into the ChatGPT desktop app. The rollout exposed scaling and billing issues, prompting changes to context limits, reasoning settings, and usage caps as competitors also adjusted their pricing and limits.
- 2Simon Willison·7/13/2026open_sourceDatasette code frequency chart on GitHub
Simon Willison shared a GitHub code-frequency chart for his Datasette open source project to illustrate changes in his coding output over time. He noted that a recent spike in activity appears to line up with use of newer AI coding models and agents such as Opus 4.8, GPT-5.5, Fable 5, and GPT-5.6 Sol.
- 7Hacker News·7/12/2026model_releasePloy switches production AI agent to GPT-5.6 Sol
Ploy says GPT-5.6 Sol has replaced Claude Opus as the default model for its production agent after head-to-head testing on real website-building tasks. The company reports the new model is 2.2x faster, 27% cheaper, and comparable or better in quality on completed work, though the migration required fixing evaluation, tool schemas, caching, and reasoning replay assumptions.
- 8The New Stack·7/11/2026model_releaseOpenAI, SpaceXAI and Meta spark an AI price war
OpenAI, SpaceXAI, and Meta each launched or expanded new AI models within a 24-hour window, but the shared headline was pricing rather than capability. The article argues that frontier AI is increasingly competing on lower token costs and efficiency, signaling growing pressure on margins across leading model providers.
- 9Hacker News·7/10/2026breakthroughGPT-5.6 Sol Ultra claims proof of the Cycle Double Cover Conjecture
A Hacker News post highlights a claim that GPT-5.6 Sol Ultra produced a proof of the Cycle Double Cover Conjecture, a long-standing problem in graph theory. The post points to a PDF prompt and a social media thread discussing the result, drawing substantial attention from the HN community.
- 8The New Stack·7/10/2026product_launchOpenAI, Microsoft and Anthropic split on agent control
OpenAI launched ChatGPT Work on GPT-5.6, extending agentic workflows to local files and Google Workspace and Microsoft 365 documents for Pro, Enterprise, and Edu users. The article compares this and similar offerings from Microsoft, Anthropic, Perplexity, and Amazon across four deployment archetypes, focusing on who controls runtime, memory, credentials, and policy.