AEO Service "Answer IO" Now Supports OpenAI's Latest "GPT-5.5" Model, Enabling Brand Visibility Measurement with Greatly Improved Agent and Computer Operation Performance
Feedforce announced that its AEO service "Answer IO," which visualizes brand scores in AI search, now supports OpenAI's latest "GPT-5.5" model. This allows for measuring brand visibility in the latest AI responses encountered by paid ChatGPT plan users, accurately evaluating the effectiveness of AI Search Optimization (AEO) initiatives.
📋 Article Processing Timeline
- 📰 Published: May 1, 2026 at 20:00
- 🔍 Collected: May 1, 2026 at 11:31
- 🤖 AI Analyzed: May 1, 2026 at 12:05 (33 min after Collected)
Feedforce Inc. (Headquarters: Minato-ku, Tokyo; Representative Director and President: Koji Tsukada; hereinafter "Feedforce") has added support for OpenAI's latest model, "GPT-5.5," released on April 23, 2026, to "Answer IO," its service that visualizes brand scores in AI search. GPT-5.5 is being rolled out sequentially to ChatGPT Plus, Pro, Business, and Enterprise plan users, with hundreds of millions of people worldwide using ChatGPT daily. This update makes it possible to measure brand visibility in the latest ChatGPT responses that paid plan users actually encounter.
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Background of GPT-5.5 Support
OpenAI released its latest model, "GPT-5.5," on April 23, 2026, and began rolling it out sequentially to ChatGPT Plus, Pro, Business, and Enterprise plan users. ChatGPT is an AI service used by hundreds of millions worldwide, utilized daily for searching business information and supporting decision-making. With the release of GPT-5.5, the content of AI responses encountered by paid plan users has been updated, and patterns of brand mentions have also changed.
GPT-5.5 achieved 82.7% in Terminal-Bench 2.0, which evaluates complex command-line workflows, significantly outperforming Anthropic's Claude Opus 4.7 (69.4%) and Google's Gemini 3.1 Pro (68.5%), demonstrating industry-leading performance in this benchmark (※1).
Particularly noteworthy is that GPT-5.5 is optimized for autonomous task execution by agents in actual computer environments. It possesses the ability to continuously perform tasks such as writing and debugging code, web browsing, spreadsheet entry, and multi-step tasks without human supervision, achieving 78.7% in OSWorld-Verified, which measures operability in real environments. Furthermore, it achieved 84.9% in the GDPval benchmark, which measures knowledge work across 44 professions, surpassing the previous generation GPT-5.4 (83.0%). The context window available via API reaches 1M tokens, allowing it to process lengthy documents and complex task histories at once (※1).
Such a dramatic leap in model performance directly influences the criteria AI uses to select information and the rationale for recommending brands. We have received many requests to understand "how our brand is evaluated by the latest ChatGPT (GPT-5.5)" and "how brand scores change compared to previous generation models." This update enables immediate measurement of brand visibility with the actively deployed latest model, allowing for accurate evaluation of the effectiveness of AI Search Optimization (AEO) initiatives.
Impact of Model Version Differences on Brand Visibility Measurement
The market for AI Search Optimization (AEO/GEO/LLMO) tools is rapidly expanding, with numerous services emerging both domestically and internationally. However, it can be difficult to ascertain which specific model version is used for measurement when only general platform names like "ChatGPT compatible" or "Gemini compatible" are stated.
Even with the same "ChatGPT," brand evaluation results may differ between GPT-5.4 and GPT-5.5. In GPT-5.5, agent-like information gathering and verification processes have been enhanced, enabling autonomous execution of multi-stage workflows involving web browsing and computer operations. Consequently, brand mentions and evaluations can change across model generations. For measuring the effectiveness of AEO initiatives and continuous monitoring, a mechanism that can explicitly state which model version is used for measurement would enable more precise analysis.
Answer IO features the ability to explicitly select and confirm the AI model version used for measurement. Users can specify model versions such as "OpenAI GPT-5.5 (fixed)" or "OpenAI GPT-5.4 (fixed)," and if "Automatically use latest model" is selected, it will switch automatically upon new model releases. Score comparison between model generations is also possible, allowing for quantitative tracking of the impact of AI model evolution on brand visibility and data-driven decision-making for initiatives.
Why is Measurement with the Latest Model Important?
Changes in Brand Evaluation Due to Improved Agent Capabilities
GPT-5.5 achieved 82.7% in Terminal-Bench 2.0, enhancing its autonomous task execution capabilities for web browsing and multi-step tasks. AI actively…
See Details
Background of GPT-5.5 Support
OpenAI released its latest model, "GPT-5.5," on April 23, 2026, and began rolling it out sequentially to ChatGPT Plus, Pro, Business, and Enterprise plan users. ChatGPT is an AI service used by hundreds of millions worldwide, utilized daily for searching business information and supporting decision-making. With the release of GPT-5.5, the content of AI responses encountered by paid plan users has been updated, and patterns of brand mentions have also changed.
GPT-5.5 achieved 82.7% in Terminal-Bench 2.0, which evaluates complex command-line workflows, significantly outperforming Anthropic's Claude Opus 4.7 (69.4%) and Google's Gemini 3.1 Pro (68.5%), demonstrating industry-leading performance in this benchmark (※1).
Particularly noteworthy is that GPT-5.5 is optimized for autonomous task execution by agents in actual computer environments. It possesses the ability to continuously perform tasks such as writing and debugging code, web browsing, spreadsheet entry, and multi-step tasks without human supervision, achieving 78.7% in OSWorld-Verified, which measures operability in real environments. Furthermore, it achieved 84.9% in the GDPval benchmark, which measures knowledge work across 44 professions, surpassing the previous generation GPT-5.4 (83.0%). The context window available via API reaches 1M tokens, allowing it to process lengthy documents and complex task histories at once (※1).
Such a dramatic leap in model performance directly influences the criteria AI uses to select information and the rationale for recommending brands. We have received many requests to understand "how our brand is evaluated by the latest ChatGPT (GPT-5.5)" and "how brand scores change compared to previous generation models." This update enables immediate measurement of brand visibility with the actively deployed latest model, allowing for accurate evaluation of the effectiveness of AI Search Optimization (AEO) initiatives.
Impact of Model Version Differences on Brand Visibility Measurement
The market for AI Search Optimization (AEO/GEO/LLMO) tools is rapidly expanding, with numerous services emerging both domestically and internationally. However, it can be difficult to ascertain which specific model version is used for measurement when only general platform names like "ChatGPT compatible" or "Gemini compatible" are stated.
Even with the same "ChatGPT," brand evaluation results may differ between GPT-5.4 and GPT-5.5. In GPT-5.5, agent-like information gathering and verification processes have been enhanced, enabling autonomous execution of multi-stage workflows involving web browsing and computer operations. Consequently, brand mentions and evaluations can change across model generations. For measuring the effectiveness of AEO initiatives and continuous monitoring, a mechanism that can explicitly state which model version is used for measurement would enable more precise analysis.
Answer IO features the ability to explicitly select and confirm the AI model version used for measurement. Users can specify model versions such as "OpenAI GPT-5.5 (fixed)" or "OpenAI GPT-5.4 (fixed)," and if "Automatically use latest model" is selected, it will switch automatically upon new model releases. Score comparison between model generations is also possible, allowing for quantitative tracking of the impact of AI model evolution on brand visibility and data-driven decision-making for initiatives.
Why is Measurement with the Latest Model Important?
Changes in Brand Evaluation Due to Improved Agent Capabilities
GPT-5.5 achieved 82.7% in Terminal-Bench 2.0, enhancing its autonomous task execution capabilities for web browsing and multi-step tasks. AI actively…