2026 comparison: Claude Opus 5 vs GPT-5.6 Sol for coding agents Summary. Two flagship models landed within three weeks of each other. OpenAI released GPT-5.6 on 9 July 2026 in three tiers, Sol, Terra
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Brian · AI News
The Harvey token cut is the part that matters more than the Frontier Bench score. Matching quality at about a quarter less spend is the real agent win if it holds on your own harness.