GPT-6 Astra in Practice: Tests, Use Cases, and Feedback

Sonnet 5.5 nears the top at a blended cost of about $8 per million tokens, roughly 80% cheaper than GPT-6 Astra (Max), reshaping the cost-efficiency frontier.

A Spanish developer notes that GPT-6.1 Sol is close to Astra-level performance at one-fifth the price, with stronger coding, agent and computer-use abilities.

GPT-6 Astra Ultrafast is billed at 6x pricing, $60 per million input tokens and $300 per million output tokens, and is described as good but pricey.

A developer lists six things from the DevDay keynote: the dots agent, Sol 6.1, the Jev clone, Ultrafast, a $500 subscription, and ChatGPT login and marketplace.

An attendee summarizes DevDay 2026: Sol 6.1 delivers near-Astra performance at one-fifth the cost, alongside Dots and Codex developer updates, though nothing felt groundbreaking.

A comment notes OpenAI did not show the FrontierCode chart: the new model is only slightly ahead of Astra and behind GPT-6 Sol at Max level, but much cheaper.

A developer used GPT-6 Astra to quickly build a tool that processes three-camera Insta360 X5 footage, grouping and syncing takes and extracting perspective images for Gaussian splatting datasets.

Ultrafast reaches up to 300 tokens per second on Codex, is available today on GPT-6 Astra with GPT-6.1 Sol to follow, works on Pro 500 and other tiers plus the API, and costs 6x the normal API price.

A post lists everything announced at Dev Day 2026: Dots, ChatGPT Space, Pages, GPT-6.1 Sol, Astra Ultrafast, Pro 500 and more.

A brief benchmark comparison: Sol's top tier nearly matches Astra's top tier.

A video meme showing the reaction of agent-focused startup founders after seeing dots powered by GPT-6 Astra.

Devin Fusion update: use a ChatGPT subscription directly to power the Astra lead while a free SWE-2 sidekick executes the work, bringing subscription quota into the coding agent.