GPT-5.1 represents a meaningful step forward in LLM capabilities. Three key improvements stand out:
1. Engine Segmentation & Personality Presets
The ability to segment different engine types with distinct personalities is genuinely useful. As a GTM builder, this means I can deploy contextually-optimized responses without extensive prompt engineering overhead.
2. Superior Instruction Following
The model now handles multi-step constraints simultaneously. Complex instructions that previously required 3-4 iterations now work on the first try. This directly reduces latency in production systems.
3. Improved Tone Adaptation
GPT-5.1 understands conversational context better. It shifts tone appropriately based on input, which matters more than people realize for enterprise adoption. Technical superiority loses to human-like interaction every time.
The Real Unlock: This isn't a revolutionary leap. It's a solid incremental advance that compounds when deployed at scale. The real advantage goes to teams building on top of this—not those claiming AGI is here.
Raycast
What's new in the Codex app
🔀 Built-in worktrees
Enable multiple agents to work without conflicts
• Use isolated worktrees in same repository
• Review clean diffs and provide inline feedback
📋 Plan mode
Type /plan to go back and forth with Codex
• Create thorough plans before you start coding
• Iterate on your approach with the agent
🗣️ Personalities
Choose the interaction style that fits your vibe
• Use the /personality command across all surfaces
• Pick a pragmatic or conversational style
🚀 Skills
Connect the tools you already use and go beyond writing code
• Deploy to @Vercel , fetch from @Figma , manage @Linear, and more
• Bundle your workflows into reusable skills
🔁 Automations
Delegate repetitive recurring tasks in the background
• Set up tasks for issue triage, failure reports, and more
• Combines skills and custom instructions to run on a schedule
Available on macOS, with Windows coming soon.
To celebrate, Plus, Pro, Business, Enterprise, and Edu users have doubled rate limits across the Codex app, CLI, IDE extension, and cloud.
Codex is also included in Free and Go plans for a limited time.
Automating repetitive tasks in the background? You r basically turning us all into Neo, but without the cool sunglasses:D Love the Vercel integration! Is the doubled rate limit just for the launch party, or can we get used to this luxury?)
Finally, a team of agents that doesn't ask for a raise or free snacks in the office!) Jokes aside, the isolated worktrees are a massive win for project management. Are there any limits on how many parallel agents we can run in the Business plan?
Zivy
Interesting stuff!