July 2026 Model Wave — Grok 4.5, Kimi K3, GPT-5.6 Sol Rollout

July 2026 saw simultaneous frontier releases across labs. xAI Grok 4.5 (July 8), Moonshot Kimi K3 (July 16), OpenAI GPT-5.6 Sol variant (preview, staged rollout from late June). Grok 4.3 also became available on Amazon Bedrock at $1.25/$2.50 per million tokens — cheapest major-lab model on Bedrock.

The multi-provider frontier is now the default reality. Enterprise procurement via Bedrock (Claude + Nova + Llama + Mistral + Grok in one contract) makes model-swapping structural, not experimental. For builders: single-provider dependence is now legacy architecture.

Test 2-3 models on your actual workload before committing. Grok 4.5 for chatty consumer product features. Kimi K3 for cost-sensitive coding agents (Kimi has been ~5-6x cheaper than frontier US models). GPT-5.6 Sol for OpenAI ecosystem users.