FactCheckRadar
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Published fact-check
Claim checked
“GPT 5.5 and GPT 5.5 Pro spotted on OpenRouter Its coming”
Published
Updated
Social media reports claim that OpenAI's unreleased GPT 5.5 and GPT 5.5 Pro models have been spotted on the LLM aggregator platform OpenRouter. While specific model IDs have appeared in the platform's URL structure, the models are currently marked as "not available," and they do not appear in the official public directory.
The claim stems from viral posts on X (formerly Twitter) highlighting specific model identifiers such as openai/gpt-5.5-20260423.
However, direct evidence from OpenRouter's website shows that these specific endpoints return a message stating the model is "not available" (Source: OpenRouter). Furthermore, a fact-check report from April 23, 2026, indicates that the most advanced OpenAI model officially listed and supported on the platform is GPT-5.4 (Source: FactCheckRadar).
There have been no official announcements from OpenAI or OpenRouter confirming the existence or imminent release of a 5.5 version. The appearance of these IDs may indicate internal testing or placeholders, but it does not confirm a public release or that the models are functional.
Source quality: The evidence includes direct links to OpenRouter's model pages and a contemporary fact-check report that specifically addresses the viral claim and the current state of the platform's model directory.
openai/gpt-5.5-20260423 exists on the OpenRouter domain but explicitly states the model is not available.
High
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5 reviewed sources behind this verdict.
The official OpenRouter models directory, used to verify which models are publicly accessible.
Provides a comprehensive fact-check of the viral claim, confirming that GPT-5.4 is the latest official version available.
Directly shows that the specific GPT 5.5 model ID mentioned in the claim is currently unavailable on the OpenRouter platform.
Overview. GPT-5 is OpenAI's most intelligent model yet, and it brings major gains across reasoning, reliability, and specialized use cases.
# OpenAI: GPT-5. ### openai/gpt-5. GPT-5 is OpenAI’s most advanced model, offering major improvements in reasoning, code quality, and user experience. ## Providers for GPT-5. ### OpenRouter routes requests to the best providers that are able to handle your prompt size and parameters, with fallbacks to maximize uptime. ## Performance for GPT-5. ### Compare different providers across OpenRouter. ## Effective Pricing for GPT-5. ### Actual cost per million tokens across providers over the past hour.