Topic
4 posts about GPT-5.5 from Simon Carter.
OpenAI is replacing named-model selection in ChatGPT with effort-based tiers — Instant, Medium, High, and more — rolling out to Plus and Pro users now.
OpenAI's frontier models and Codex coding agent hit GA on Amazon Bedrock, with IAM access, VPC isolation, CloudTrail logging, and pay-per-token billing.
OpenAI has improved GPT-5.5 Instant's response quality and quietly retired Canvas in favour of native writing and code blocks in chat.
OpenAI replaced GPT-5.3 Instant with GPT-5.5 Instant as ChatGPT's default model on May 5, 2026, bringing fewer hallucinations and tighter responses.