Tool tag: Frontier Model

GPT-6 Astra

OpenAI's flagship since September 4, 2026. A 1,050,000-token reasoning model for long-horizon agentic work, with native computer use.

Muse Spark 1.3

Meta's frontier reasoning model, shipped September 2, 2026: a 1M-token multimodal agent model at $1.25/$4.25 per million tokens.

Claude Fable 5.1

Anthropic's most capable widely released model: same $10/$50 pricing as Fable 5, cache reads cut 75%, 1M context and always-on adaptive thinking.

Claude Opus 5

Anthropic's Opus-tier flagship — near-Fable capability at half the price, with adaptive thinking on by default and a 1M token context window.