Alternatives to GPT-6 Astra

These tools sit near GPT-6 Astra. Compare features and pricing before you switch.

Open GPT-6 Astra listing · AI Tools Rankings 2026 | Hot & Featured

Alternatives

GPT-5.6 Sol: previous OpenAI flagship, cheaper per token.
Claude Fable 5: Anthropic frontier coding and computer use.
Claude Mythos 5.1: Anthropic's less-restricted sibling if your job is cyber eval, not ChatGPT.

GPT-5.6 Sol

Models

OpenAI frontier flagship GPT-5.6 Sol: 1.05M context, effort up to max plus ultra, $5/$30 per 1M tokens.

#OpenAI

15000000DR: 95AS: 95

Claude Fable 5

Models

Anthropic's Mythos-class flagship made safe for general use, with 1M-token context, frontier coding and vision, days-long agentic autonomy, and $10/$50 per 1.

#Anthropic

3000000DR: 92AS: 95

Claude Mythos 5.1

Models

Anthropic's most capable model for cybersecurity and biology, gated behind invite-only trusted access. Same engine as Claude Fable 5.1 with relaxed safeguards for vetted organizations.

#Anthropic

—DR: —AS: —