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GPT-5.4 vs Claude Opus 4.6 vs Gemini 3.1 Pro vs Composer 2 (archive, April 2026)

What we compared in April 2026 — GPT-5.4, Claude Opus 4.6, Gemini 3.1 Pro and Composer 2 — kept as a dated archive, with a link to the current comparison.

Soheil Saheb-Jamii2 min read

Last reviewed on September 1, 2026

GPT-5.4 vs Claude Opus 4.6 vs Gemini 3.1 Pro vs Composer 2 (archive, April 2026)

What this comparison looked like in April 2026

In April 2026 the four options a coding team was weighing were GPT-5.4 (OpenAI’s general-purpose flagship of the moment), Claude Opus 4.6 (Anthropic’s long-task model), Gemini 3.1 Pro (Google’s multimodal, large-context model) and Composer 2 (Cursor’s own coding model, routed inside its editor). The verdict was already “no single winner”: GPT-5.4 for demanding general work, Opus 4.6 for long, multi-step tasks, Gemini 3.1 Pro for speed and large contexts, Composer 2 when the workflow lived in Cursor.

What changed since

  • Every model in the lineup has been superseded: GPT-5.5 replaced GPT-5.4, Claude Fable 5 replaced Opus 4.6 as the long-task model, Gemini 3.5 Flash took over the speed-and-context slot, and Cursor moved from a single model to an agent layer that routes across models.
  • The selection criteria did not change. Difficulty of the task, cost per successful task, context size and the execution environment still decide more than benchmark rankings. That is why the current version keeps the same structure.
  • Agent execution moved into the tools. In April the question was “which model”; by September it is as much “which harness”: Claude Code, Codex, Cursor and their MCP connections shape the result at least as much as the model. See what MCP changes for AI coding tools.

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