# OpenAI: GPT-6 Astra Pro

Provider: openai  
Category: llm  
Model ID: `openai/gpt-6-astra-pro`

GPT-6 Astra Pro is the same underlying model as [GPT-6 Astra](https://openrouter.ai/openai/gpt-6-astra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. **Cost note:** pro mode spends far more...

## Specs

- Context length: 1050000 tokens
- Max output: 128000 tokens
- Modalities: file, image, text
- Released: 2026-09-04

## Pricing

- Input: $10.00 per million tokens
- Output: $50.00 per million tokens

## Providers

- **openai** — ctx 1050000, input $10.00/M, output $50.00/M

## Verdict

GPT-6 Astra Pro delivers OpenAI's largest context window yet at 1.05M tokens, making it the go-to for processing entire codebases, legal document sets, or multi-hour transcripts in a single pass. Output pricing at $50/Mtok is steep compared to alternatives like Claude 3.7 Sonnet ($15/Mtok) or Gemini 2.0 Flash ($1.50/Mtok), so reserve it for tasks where the million-token context genuinely saves you multi-turn orchestration costs. Best for teams who need to reason over massive inputs without chunking or RAG complexity.

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Last verified: 2026-10-19T02:30:34.239Z  
Canonical URL: https://switchy.build/directory/models/gpt-6-astra-pro