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Opus 5.5 and GPT-6 Sol charge the same $0.20 per million cached tokens where agent loops spend most of their money. Sol halves Opus 5.5 on input and output; GPT-6 Luna undercuts both by 20x on cache reads.
StepFun's Step 5 Preview is a 600B-total/27B-active sparse MoE coding model with 1M-token context and a live API at $1.00/$2.70 per M tokens plus a 95% cache discount. Independently measured at AA index 44; open weights promised October 15, no license named yet. Here is what is verified, what is vendor-reported, and what it really costs per coding-agent task.
MiMo-V2.6-Pro-RL is a 1.02T-parameter MoE with 1M-token context and omni I/O, released under MIT with its $3.47M RL post-training counted live on a public dashboard. AA Intelligence Index: 46, the top open-weights spot.
Plugin4Shell turns plugin SHA pinning into an illusion: a branch named like the pinned commit makes git swap in attacker code while the agent reports the audited version installed. Here is how it works, who has patched, and what to check today.
