GPT-5.5
Model ● Covered in 44 stories + Follow
GPT-5.5 is described in recent coverage as an OpenAI frontier model whose performance and behavior have been evaluated across benchmarks and real-world uses. It has been referenced in deployments and integrations (e.g., routing OpenAI Codex traffic via a LiteLLM gateway mapped to an “openai.gpt-5.5” alias on AWS services) as well as in comparative reporting on accuracy, hallucination tendency, and cost. GPT-5.5 also figures in security-related allegations, where U.S. agencies accused at least one entity of extracting large volumes of capabilities from the model and integrating them into other systems.
Updated 13 September 2026
Specifications
No specifications recorded yet.
Latest developments
GPT-5.5 Outperforms (and Hallucinates), Kimi K2.6 Leads Open LLMs, AI Strains Climate Pledges, Strategic Thinking in LLMs vs. Humans
The Batch ·
40
Open-weight AI models are catching up to the frontier. The safety gap remains.
TechCrunch · 1 month ago ·
21
Apple and Bynario agree GPT-5.5 found a real macOS bug. They disagree on the report cap.
The New Stack · 1 month ago ·
21
AI researchers call for new tools that can slow automated model development
SiliconANGLE · 1 month ago ·
33
September 2026
US NSA, CISA, and FBI issued an advisory accusing six Chinese AI firms of bulk distillation of capabilities from US frontier models Security issue
- U.S. Agencies Accuse Six Chinese AI Firms of Siphoning Claude, GPT, Gemini and Grok
- Set up OpenAI ChatGPT Codex with LiteLLM on Amazon ECS and Amazon Bedrock
August 2026
Together AI reported DeepSWE benchmark results comparing GLM-5.3 with GPT-5.6 Sol and Claude Fable 5, including a proposed two-model routing approach Benchmark result
OpenAI Releases GPT-5.5 with High Benchmark Performance but Increased Hallucination Issues Model release
Open-weight AI models demonstrate improved capabilities but lag in safety measures compared to frontier models Benchmark result
- Inherent, founded by DeepMind alumni, says its AI ‘teammate’ just outperformed Anthropic and OpenAI at replicating research
- GPT 5.6 Sol is the best "vision" model OpenAI ever released
- GPT-5.5 Outperforms (and Hallucinates), Kimi K2.6 Leads Open LLMs, AI Strains Climate Pledges, Strategic Thinking in LLMs vs. Humans
- Open-weight AI models are catching up to the frontier. The safety gap remains.
- Apple and Bynario agree GPT-5.5 found a real macOS bug. They disagree on the report cap.
July 2026
Moonshot AI releases Kimi K3, a 2.8 trillion parameter open-weight model achieving frontier-class performance Open source release
Moonshot AI released Kimi K3, an open-weight large language model Model release
Open-source AI models demonstrate cost and performance competitive with frontier proprietary models Benchmark result
OpenAI releases GPT-5.6 model family with three tiers (Luna, Terra, Sol) and new multi-agent capabilities Model release
xAI launches Grok 4.5, an Opus-class large language model developed in partnership with Cursor Model release
OpenAI releases GPT-5.6 model family with improved efficiency and reasoning capabilities Model release
OpenAI releases GPT-Live, a low-latency voice model for real-time conversational AI Feature update
OpenAI releases GPT-5.6 in multiple variants alongside frontier AI model releases from competitors Model release
Anthropic redeployed Fable 5 AI model with enhanced safety restrictions following government export controls Feature update
- AI researchers call for new tools that can slow automated model development
- Cursor's Agent Swarm: Cheaper Models Handle Most Coding When Frontier Models Plan
- LWiAI Podcast #247 - Opus 4.8, MAI, Anthropic IPO, Minimax-M3
- [AINews] Kimi K3 2.8T-A50B: the largest open model ever released; Opus 4.8-class at Sonnet 5 pricing
- Agentic Misalignment in Summer 2026
- Open-source AI is just “4 months behind” closed frontier models — and 10x cheaper
- datasette code-frequency chart on GitHub
- Basecamp Bench
- 6 months to live for open models
- [AINews] not much happened today
- The Pulse: Interesting AI coding stats from Cursor
- OpenAI GPT-5.6: AI Could Do Anything, Then It Met ARC-AGI-3
- Grok x Cursor
- GPT-5.5 Bio Bug Bounty
- Introducing GPT‑Live
- GLM 5.2 and the coming AI margin collapse (part 1)
- Fable is Back: This Safeguard Has Some AI in It!
June 2026
Multiple AI labs release new model variants and agent capabilities Model release
OpenAI Codex adoption in production applications across engineering and scientific research Deployment
Anthropic releases Claude Opus 4.8 with improved agentic capabilities and dynamic workflows Model release
- SkillOpt: Agent skills as trainable parameters
- The Sequence Radar #885: Last Week in AI: Models, Games, and the Future of Evaluation
- The State of AI Post-Training Agents
- ParallelKernelBench: Frontier LLMs can't write fast multi-GPU kernels (yet)
- How engineers at Nextdoor use Codex to build without limits
- How Wasmer used Codex to build a Node.js runtime for the edge
- Opus 4.8
May 2026
- Deep Learning Weekly: Issue 457
- How Braintrust turns customer requests into code with Codex
- Warp’s big bet on building open source with GPT-5.5
- How Ramp engineers accelerate code review with Codex
- Databricks brings GPT-5.5 to enterprise agent workflows
- How NVIDIA engineers and researchers build with Codex
- Scaling Trusted Access for Cyber with GPT-5.5 and GPT-5.5-Cyber
- LWiAI Podcast #243 - GPT 5.5, DeepSeek V4, AI safety sabotage
April 2026
OpenAI releases GPT-5.5 model with improved coding and reasoning capabilities Model release
Relationships
Products & technology
- OpenAI develops this model · 19 sources
- Derived from GPT-5.4 Pro · 1 source
- Integrated with macOS · 1 source
- NVIDIA deploys this model · 1 source
- Databricks integrated with this model · 1 source
- Warp integrated with this model · 1 source
- Warp deploys this model · 1 source
- Braintrust integrated with this model · 1 source
- Nextdoor deploys this model · 1 source
- GPT-Live integrated with this model · 1 source
- Braintrust deploys this model · 1 source
- Amazon Web Services deploys this model · 1 source