GPT-5.6 rollout and developer tool updates #63
Today's Letter
OpenAI previews GPT-5.6 Sol, Terra, and Luna
- OpenAI introduced the GPT-5.6 family with three tiers: Sol, Terra, and Luna.
- Initial access is limited to about 20 partner organizations, with broader availability planned in the coming weeks.
- OpenAI said it shared the models and launch plan with the U.S. government before the June 26 preview.
- Sol is positioned for complex coding, security research, and long-running agent workflows.
- Terra targets high-volume business workloads such as customer support, internal tools, and document analysis.
- Luna is the fastest and lowest-cost tier for summarization, drafting, and routine automation.
- Reported API pricing is $5/$30 per 1M tokens for Sol, $2.50/$15 for Terra, and $1/$6 for Luna.
- VentureBeat reported that OpenAI rates all three models at its High risk level for cyber and bio/chemical capability.
Source: venturebeat.com
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Vercel CLI, Speed Insights query support added
- Vercel added direct Speed Insights datapoint queries to the Vercel CLI on June 29, 2026.
- The new `vercel metrics` command can return Core Web Vitals including LCP, INP, and CLS.
- The same command also exposes page performance metrics such as FCP and TTFB.
- Metrics are based on client-side measurements collected from real user traffic rather than synthetic test runs.
- The CLI query flow can be used to check regressions over time, compare regions, and split results by dimensions such as device type.
- Vercel positions the command as a useful interface for coding agents that need to answer performance questions from production traffic.
- Documentation includes the supported metrics, dimensions, filters, and query options for the command.
Source: vercel.com
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