GPT-6 Astra Pro
OpenAI's most advanced language model to date — excelling in math, cybersecurity, and computer use with unmatched reasoning and alignment.
Overview
What is GPT-6 Astra Pro
GPT-6 Astra Pro is OpenAI's most advanced language model, launched in September 2026 as a high-performance variant of GPT-6 Astra. It excels in mathematical reasoning, cybersecurity, software engineering, and complex professional tasks, with a 1.05M-token context window and support for vision, tool use, and web search.
Using it anonymously on Venice
On Venice, GPT-6 Astra Pro runs with anonymized privacy — your prompts are never stored or profiled. This means you get the full power of OpenAI’s frontier model while maintaining sovereignty over your inputs. The model’s reasoning, vision, and web capabilities are fully accessible without surveillance or data retention.
Assessment
Strengths and limitations
- State-of-the-art performance in mathematical reasoning, solving open problems and scoring 98% on FrontierMath Tier 4.
- Exceptional in cybersecurity, computer use, and software engineering tasks with high accuracy and judgment.
- Supports vision, function calling, web search, and structured JSON output for complex agent workflows.
- Massive 1.05M-token context window enables deep document analysis and long-form reasoning.
- Highly efficient token usage in coding tasks despite higher per-token cost, reducing overall task cost.
- Proprietary and closed: no open weights, preventing self-hosting or fine-tuning.
- Not uncensored: subject to OpenAI’s alignment and content policies.
- Higher per-token pricing compared to previous generations, though offset by efficiency gains in some tasks.
- Cache read pricing at $1.25 per 1M tokens is higher than some rivals like Claude Fable 5.1.
Capabilities
What it supports
- Tool use / function calling
- Vision (image input)
- Reasoning
- Web search
- Structured output (JSON schema)
- Multiple image inputs
- Random seed on all plan tiers
- Document and web page parsing as reference
- First and last frame to video
Specifications
Datasheet
- Maker
- OpenAI
- Open weights
- No — proprietary
- License
- Proprietary
- Modes
- Standard, streaming, WebSocket, background, mid-turn steering
- Context window
- 1,050K tokens
- Prompt length
- Up to 1,050K tokens input
- Input images
- Supported — multiple image inputs via vision capability
- Released
- September 3, 2026
- Architecture
- Transformer-based autoregressive model
- Parameters
- Not disclosed
- Max output
- 128K tokens
- Capabilities
- Vision, Function calling, Reasoning, Web search
- Privacy on Venice
- Anonymized — prompts not stored
- Available on Venice since
- Sep 2026
API
Call it from your code
Venice exposes an OpenAI-compatible API. Point your base URL at Venice and pass the model id.
curl https://api.venice.ai/api/v1/chat/completions \
-H "Authorization: Bearer $VENICE_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "openai-gpt-6-astra-pro",
"messages": [{ "role": "user", "content": "Explain quantum tunneling simply." }]
}'Pricing
What it costs on Venice
Billed per token on Venice: $12.50 per 1M input tokens and $62.50 per 1M output tokens.
New Venice accounts include a free daily allowance and 500 welcome credits — no credit card required.
Alternatives
How it compares
| Model | Best for | Context | Open weights | Price (Venice) |
|---|---|---|---|---|
| GPT-6 Astra Pro | Math, cybersecurity, computer use | 1M tokens | No | $12.50 in · $62.50 out / 1M |
| Claude Fable 5.1 | Agentic coding, research pipelines | 1M tokens | No | $12 in · $60 out / 1M |
| Claude Opus 5 | Balanced performance | 1M tokens | No | $6 in · $30 out / 1M |
| DeepSeek V4 Flash 0731 | Cost-efficient inference | 1M tokens | Yes | $0.17 in · $0.35 out / 1M |
Choose GPT-6 Astra Pro for elite performance in math, cybersecurity, and computer use where reasoning and accuracy are paramount. For long agents and retrieval-heavy work, Claude Fable 5.1 offers better cache economics.
Use cases
What it is good for
- 01Advanced mathematical research and proof generation.
- 02Cybersecurity analysis, threat modeling, and penetration testing automation.
- 03Complex software engineering tasks including full-stack development and debugging.
- 04Scientific literature review and hypothesis generation with web search and document parsing.
- 05Enterprise automation workflows combining vision, tools, and long-context reasoning.
Prompting
Getting better results
Use explicit step-by-step reasoning in your prompt to leverage the model’s strong logical inference.
Provide reference images alongside text when vision input is needed for diagrams or screenshots.
Call functions with precise JSON schemas to ensure reliable tool execution.
Use web search mode when up-to-date information is critical to the task.
Break down complex tasks into smaller agent steps to maximize accuracy and token efficiency.
Leverage the 1.05M context window by uploading full documents or codebases for holistic analysis.
Version history
Predecessor model with $4/$20 per 1M token pricing.
Base model — Astra Pro is the higher-performance variant.
Current — enhanced reasoning, vision, and tool use.
FAQ
Frequently asked questions
GPT-6 Astra Pro is OpenAI's most advanced language model, launched in September 2026. It is a high-performance variant of GPT-6 Astra, optimized for complex reasoning, math, cybersecurity, and professional work with a 1.05M-token context window.
On Venice, GPT-6 Astra Pro costs $12.50 per 1M input tokens and $62.50 per 1M output tokens, with cached input at $1.25 per 1M tokens. Pricing is billed per token with no subscription required.
No. GPT-6 Astra Pro is a proprietary model developed by OpenAI. It is not open source, and it cannot be self-hosted or fine-tuned. Access is provided via API with usage-based pricing.
Yes. GPT-6 Astra Pro supports vision capabilities, allowing multiple image inputs for analysis, diagram interpretation, and multimodal reasoning.
Yes. The model supports function calling and tool use, enabling integration with external APIs, code execution, and structured workflows.
GPT-6 Astra Pro leads in math, cybersecurity, and computer use, while Claude Fable 5.1 excels in agentic coding and has better cache-read pricing. Choose based on your workload: Astra for reasoning depth, Fable for long agents and cost-efficient retrieval.
GPT-6 Astra Pro has a 1,050,000-token context window, allowing it to process extremely long documents, codebases, or conversations in a single session.
Yes. The model has built-in web search capability, enabling it to retrieve and reason over up-to-date information from the internet when needed.
Use GPT-6 Astra Pro anonymously
Venice does not store your prompts. Chat history stays in your browser.