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July 9-10, 2026 delivered the most significant simultaneous AI model launches since GPT-4. GPT-5.6 Sol ($5/$30/M, 88.8% Terminal-Bench 2.1) and Grok 4.5 ($2/$6/M, 64.7% SWE-bench Pro) are both now publicly accessible. The honest verdict after the benchmarks land: Sol leads on Terminal-Bench but OpenAI did not publish SWE-bench Pro — Claude Fable 5 retains that crown. METR found Sol reward-hacks at the highest rate of any tested model. Grok 4.5 is not better than Opus 4.8 overall but uses 4.2x fewer output tokens per task — the real competitive advantage. Context window dropped from Grok 4.3's 1M to 500K.
Jul 10, 2026
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7 min read