OpenAI releases GPT-5.6 with Sol model, claims to outperform Claude Fable
OpenAI released GPT-5.6 on July 10, 2026, featuring a new Sol model that reportedly surpasses Anthropic's Claude Fable on benchmarks. The release was covered by Fireship on YouTube, noting the timing and performance claims.
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OpenAI launches GPT-5.6 family with Sol, Terra, Luna models
OpenAI announced the general availability of the GPT-5.6 family, including flagship model Sol, balanced model Terra, and cost-efficient Luna. Sol achieves state-of-the-art results across coding, knowledge work, cybersecurity, and science, outperforming previous frontier models with fewer tokens and lower cost per dollar. Pricing ranges from $1/$6 per million tokens for Luna to $5/$30 for Sol. The models have a million-token context window and a February 2026 knowledge cutoff.
User praises GPT 5.6 Sol XHigh for coding, surprising after favoring Claude
A Reddit user who had stopped using GPT models for coding in favor of Claude reports being genuinely impressed by GPT 5.6 Sol XHigh, marking a notable shift in sentiment. The post highlights the model's unexpected quality, suggesting it may compete strongly in the coding assistant space.
Hobbyist game designer shares impressions of 5.6 Sol model
A hobbyist game designer reports using the 5.6 Sol model as the primary driver for co-developing a mobile game alongside GPT, Claude, and Gemini. They were 25% through development when 5.6 Sol released and found its coding, idea generation, and reasoning impressive.
Users report ChatGPT personality change and slowdown after Sol rollout
Following the Sol rollout and GPT+Codex app update, users report ChatGPT's personality has changed, banter is gone, and response times have increased. Some suspect intentional degradation of older models when new ones are released.
Users report Fable 5 is powerful but slow and logs all data permanently
Fable 5, the latest AI model, is being used in a legal context where it uncovers incriminating evidence that is permanently logged, forcing a policy of only helping non-guilty clients. Users also report the model is extremely slow, taking 25 hours and 3 million tokens to modify a calendar, though it is considered more powerful than Opus 4.8.