Teamday

Chat & Reasoning Model · OpenAI

GPT-6 Astra

GPT-6 Astra is OpenAI's most capable model and the first of the GPT-6 generation, rolled out from September 3, 2026: a 1,050,000-token context window, 128,000 max output tokens, text and image input, an April 30, 2026 knowledge cutoff, and reasoning effort from low to max (the GPT-5.6 "none" tier is gone). OpenAI prices it at 2.5x GPT-5.6 Sol. In TeamDay it is the recommended model on the Codex harness; GPT-5.6 Sol, Terra, and Luna stay selectable as the value tiers.

Use GPT-6 Astra in TeamDay →All models

At a glance (verified 2026-09-05)

Vendor
OpenAI
Type
Chat & Reasoning Model
Context window
1.05M tokens
Pricing
Short: $10 in / $1 cache hits / $12.50 cache writes / $50 out. Long (>272K input): $20 in / $2 cache hits / $25 cache writes / $75 out per 1M tokens. Batch and Flex at 50%; Fast mode at 2x.

Best for

Hardest end-to-end reasoningAutonomous coding and computer useDeep research and document creationLong-context (1M) missions

How to use GPT-6 Astra in TeamDay

Pick GPT-6 Astra in TeamDay's chat model picker on the Codex harness — it is the recommended default. It runs on a connected ChatGPT login (Pro, Business Premium, and Enterprise from day one; Plus and Business rolling out) or an OpenAI API key; Codex CLI 0.153.4 or newer is required.

Harness: codex →Max →Daisy →

Frequently asked questions

How much does GPT-6 Astra cost?

Per 1M tokens, short context: $10 input, $1 cache hits, $12.50 cache writes, $50 output. Over 272K input tokens the whole request is billed at $20 / $2 / $25 / $75. Batch and Flex run at 50% of standard, Fast mode at 2x (Fast mode is unavailable with EU data residency). That is 2.5x GPT-5.6 Sol's promotional price.

What changed from GPT-5.6 to GPT-6 Astra?

Same 1.05M context and 128K max output, but a new generation with stronger reasoning, coding, computer use, research, and document creation, plus image input. reasoning.effort supports low, medium, high, xhigh, and max — the "none" tier of GPT-5.6 is not available. The API id is gpt-6-astra with no dated snapshots.

Is GPT-5.6 still available?

Yes — GPT-5.6 Sol, Terra, and Luna remain on OpenAI's price list and on TeamDay's Codex harness. Sol keeps its $4 / $20 promotional price through at least November 21, 2026, making it the value pick for work that does not need Astra.

Can I use GPT-6 Astra in TeamDay?

Yes — it is the recommended model on TeamDay's Codex harness, with reasoning effort selectable from low to max (high is the default). Saved chats and agents on GPT-5.6 keep their model; nothing is silently moved to the pricier tier.

Related

GPT-6 Astrais one of the models TeamDay's AI employees already run — no API keys, no infrastructure.

Hire your first AI employee →