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Models2026-08-13 · source-backed
xAI shipped it August 12 with a 500K context, February 2026 cutoff, $2/$6 per million. It scored 61 on the Artificial Analysis Index, tying GPT-5.6 Sol Max, one point behind Fable 5 Max. The number that got 334 points and 381 comments on HN is from Artificial Analysis's teardown: on long-horizon knowledge work it resolves tasks in ~53 turns and ~0.5B input tokens against Opus 5's ~103 turns and ~2.0B, at $0.84 measured cost per task. It loses clearly to Grok 4.5 High on DeepSWE and Terminal-Bench, so the agent-coding framing is uneven. Turn efficiency is the line item that moves if you pay per token.
Each link below shares sources, entities, or timing with this story.
Cursor uses Opus / Shared entities / Shared topic / Earlier coverage
Linked by a graph relationship (Cursor uses Opus); both cover Artificial Analysis, Bench, Fable, GPT; overlapping topics (gpt-5, grok, task, token).
Cursor uses Opus / Shared entities / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Cursor uses Opus); both cover Artificial Analysis, DeepSWE, Fable, GPT; overlapping topics (behind, gpt-5, grok, index, point).
OpenHands uses GPT / Shared entities / Same source domain / Shared topic / Earlier coverage
Linked by a graph relationship (OpenHands uses GPT); both cover Artificial Analysis, August, Fable, GPT; reported by the same outlet (artificialanalysis.ai).
Claude Code uses Opus / Shared entities / Shared topic / Earlier coverage
Linked by a graph relationship (Claude Code uses Opus); both cover Bench, Fable, GPT, Opus; overlapping topics (behind, gpt-5, point).
Claude Code uses Opus / Shared entities / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Claude Code uses Opus); both cover Bench, Grok, Opus, Terminal; overlapping topics (grok, task, token).
GPT competes with Grok / Shared entities / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (GPT competes with Grok); both cover Artificial Analysis, Bench, Fable, GPT; overlapping topics (analysi, artificial).
Claude Code uses Opus / Shared entities / Earlier coverage / Tension
Linked by a graph relationship (Claude Code uses Opus); both cover Bench, Fable, GPT, Opus; earlier Bench coverage from 2026-06-19.
Opus built by Anthropic / Shared entities / Earlier coverage
Linked by a graph relationship (Opus built by Anthropic); both cover Bench, Fable, GPT, High; earlier Bench coverage from 2026-06-26.