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GPT-5 vs Claude Opus 4.6 vs Gemini 2.5 Pro — Which Frontier LLM in 2026?

The three frontier models each lead on different axes. Your choice depends on whether you optimize for raw reasoning, long-context writing, or multimodal + cost.

FIG 1 — THE OPTIONS
01
GPT-5
02
Claude Opus 4.6
03
Gemini 2.5 Pro
FIG 2 — SUMMARY
  • GPT-5 leads on raw reasoning and tool use, but is most expensive per token.
  • Claude Opus 4.6 wins on long-form writing and large context coherence.
  • Gemini 2.5 Pro is the best cost/multimodal balance, especially for vision + long video.
FIG 3 — DEFAULT CRITERIA & WEIGHTS
Reasoning quality
weight 10/10
Cost per token
weight 7/10
Context window
weight 6/10
Tool use & agentic
weight 8/10

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