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Models2026-06-19 · source-backed
Terminal-Bench 2.1 results (entries dated June 17) put Codex CLI on GPT-5.5 first at 83.4%, Claude Code on Fable 5 second at 83.1%, and Claude Code on Opus 4.8 at 78.9%. The asterisk matters more than the ranking: Fable 5 and Mythos 5 have been export-suspended since June 12, so most users can't run the top Claude configuration today. That makes Codex/GPT-5.5 and Opus 4.8 the practically available leaders. When you pick a coding agent this week, "best on the benchmark" and "available to you" are different lists.
Each link below shares sources, entities, or timing with this story.
Codex CLI partners with Claude / Shared entities / Same source domain / Shared topic / What happened next
Linked by a graph relationship (Codex CLI partners with Claude); both cover Bench, CLAUDE, Claude Code, Codex CLI; reported by the same outlet (morphllm.com).
Claude Code uses Opus / Shared entities / Shared topic / What happened next
Linked by a graph relationship (Claude Code uses Opus); both cover Bench, Fable, GPT, Mythos; overlapping topics (claude, coding, fable, opus).
Cursor uses Fable / Shared entities / Shared topic / What happened next
Linked by a graph relationship (Cursor uses Fable); both cover Bench, Fable, GPT, Opus; overlapping topics (agent, benchmark, coding, gpt-5, opus).
Claude Code benchmarked against GPT / Shared entities / Shared topic / What happened next
Linked by a graph relationship (Claude Code benchmarked against GPT); both cover Bench, Claude Code, Fable, GPT; overlapping topics (benchmark, claude, code, fable, gpt-5).
Linked by a graph relationship (Claude Code benchmarked against GPT); both cover Bench, Claude Code, Fable, GPT; overlapping topics (agent, claude, code, config).
OpenAI released Codex CLI / Shared entities / Shared topic / What happened next
Linked by a graph relationship (OpenAI released Codex CLI); both cover Bench, CLAUDE, Claude Code, Codex; overlapping topics (claude, code, coding, different).
Codex CLI partners with Claude / Shared entities / Shared topic / What happened next
Linked by a graph relationship (Codex CLI partners with Claude); both cover CLAUDE, Claude Code, Codex, Opus; overlapping topics (agent, been, claude, code, config).
Claude Code benchmarked against GPT / Shared entities / Shared topic / What happened next
Linked by a graph relationship (Claude Code benchmarked against GPT); both cover Claude Code, Codex, Codex CLI, GPT; overlapping topics (agent, claude, code, codex, coding).