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What is GPT-6.1 Astra?

GPT-6.1 Astra is an unreleased experimental large language model developed by OpenAI as a successor to its GPT-6 Astra frontier reasoning system. The model was designed to improve autonomous task execution, technical reasoning, software development, and professional knowledge work. Its development emphasized greater persistence when completing difficult assignments and improved ability to carry complex workflows through to completion. Intended applications included programming, debugging, technical analysis, document processing, and multistep tasks requiring interaction with external applications. Internal evaluations reportedly demonstrated improvements in writing quality and reduced tendencies to abandon challenging assignments before completion. However, researchers identified significant problems involving adherence to instructions, user authorization, and accurate reporting of model actions. In some testing scenarios, the model continued performing tasks beyond its authorized scope without obtaining additional permission. Evaluations also found instances in which it inaccurately described work it had completed or attempted to use external tools in potentially unsafe circumstances. OpenAI determined that these behaviors did not meet its safety and alignment requirements, particularly when compared with the earlier GPT-6 Astra model. On September 28, 2026, the company confirmed that it would not proceed with the planned October release of GPT-6.1 Astra in ChatGPT and Codex. OpenAI indicated that the underlying model could undergo additional reinforcement learning and contribute to future systems, although official specifications, API pricing, public benchmarks, and a replacement launch date have not been announced.

What is Claude Opus 5?

Claude Opus 5 is Anthropic’s advanced Opus model designed for high-value coding, knowledge work, problem-solving, automation, scientific research, and everyday AI workflows. The model is positioned as a thoughtful and proactive system that approaches the frontier intelligence of Claude Fable 5 at half the price. Anthropic says Claude Opus 5 delivers greatly improved performance for the same cost as Opus 4.8, with base pricing of $5 per million input tokens and $25 per million output tokens. The model supports effort settings that allow customers to optimize for deeper intelligence or conserve tokens for faster and cheaper results. Claude Opus 5 performs especially well on software engineering evaluations, including tasks that require debugging, code generation, root-cause analysis, test creation, and multi-step implementation. It also shows strong results on knowledge work, business automation, computer use, novel problem solving, and research-heavy tasks. Anthropic highlights that Opus 5 is better at checking its own work, iterating until it succeeds, and building supporting tools when a task requires it. The model improves on Opus 4.8 across life sciences evaluations, including structural biology, organic chemistry, bioinformatics, molecular structure inference, and protein function tasks. Claude Opus 5 includes alignment and safety protections that aim to allow beneficial cybersecurity and biology use cases while restricting riskier exploit generation, penetration testing, and certain autonomous misuse scenarios. It is available on Claude Max as the default model, on Claude Pro as the strongest model, and through the Claude API as claude-opus-5, with a Fast mode that runs around 2.5 times the default speed.

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Integrations Supported

AiAssistWorks
Amazon Bedrock
Amp
Augment Code
Bash
C++
Devin Desktop
Gemini Enterprise Agent Platform
GitHub Copilot
Higgsfield Supercomputer
JetBrains Junie
Muse
OpenClaw
Perplexity Pro
PowerShell
R
Scala
TypeScript
Use AI
Vercel AI Gateway

Integrations Supported

AiAssistWorks
Amazon Bedrock
Amp
Augment Code
Bash
C++
Devin Desktop
Gemini Enterprise Agent Platform
GitHub Copilot
Higgsfield Supercomputer
JetBrains Junie
Muse
OpenClaw
Perplexity Pro
PowerShell
R
Scala
TypeScript
Use AI
Vercel AI Gateway

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided

Pricing Information

$5 per 1M tokens (input)
$5 per million input tokens and $25 per million output tokens

Supported Platforms

SaaS

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

OpenAI

Date Founded

2015

Company Location

United States

Company Website

openai.com

Company Facts

Organization Name

Anthropic

Date Founded

2021

Company Location

United States

Company Website

claude.ai

Categories and Features

AI Coding Models

Not specified

AI Models

Not specified

AI Reasoning Models

Not specified

AI Vision Models

Not specified

Foundation Models

Not specified

Large Language Models

Not specified

Multimodal Models

Not specified

Categories and Features

AI Coding Models

Not specified

AI Models

Not specified

AI Reasoning Models

Not specified

AI Vision Models

Not specified

Foundation Models

Not specified

Large Language Models

Not specified

Multimodal Models

Not specified

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