Reasoning Model API Pricing Compared - May 2026
Updated May 2026: DeepSeek V4-Flash reasoning now $0.28/MTok output (8x cheaper than R1), o3-pro launched at $20/$80, Grok 4 retires May 15 - verified pricing across 11 models.
Articles Tagged "LLM"
xAI Opens Grok 4.3 API: 83% Price Cut, Video Input
xAI opened Grok 4.3 to all API developers on May 6 with an 83% output price cut, 1M-token context, native video input, and document generation - plus five legacy models retiring May 15.
Moonshot AI Goes From $4.3B to $20B in Six Months
Moonshot AI closed a $2B round at a $20B valuation, four-times its end-2025 value, on the strength of its Kimi open-weight models and $200M ARR.
GPT-5.5 Instant
OpenAI's new default ChatGPT model cuts hallucinations by 52.5% and adds Gmail-backed personalization while maintaining the low latency of its predecessor.
Misalignment Geometry, LLM Math, and How Llama Counts
Three new papers reveal how fine-tuning misfires through feature geometry, how Llama secretly counts months, and how LLMs solved open combinatorics problems for under $30 each.
Tool-Use Tax, Jailbreak Risk, and Robot Vision
Three new papers: tools slow LLM agents under noisy prompts, jailbreaks barely dent frontier model capabilities, and interleaved text-vision traces push robot success to 95.5%.
Nebius Buys Eigen AI for $643M to Own Inference
Nebius agrees to acquire 20-person MIT inference startup Eigen AI for $643M, betting that optimizing every token per Nvidia chip is the real moat in the AI infrastructure race.
OpenAI o1 Outperforms ER Doctors in Harvard Trial
A peer-reviewed Science study puts OpenAI o1 through 76 live emergency room cases - and the model beats expert physicians on initial triage with 67.1% accuracy against 55% and 50%.
Prompt Traps, Swarm Failures, and AI-Discovered Physics
Three new papers reveal when few-shot examples hurt scientific reasoning, why homogeneous agent swarms lock in errors, and how an AI autonomously found a novel physical mechanism.
Cost Efficiency Leaderboard: Best AI Performance Per Dollar
Rankings of AI models by cost efficiency in May 2026, comparing performance per dollar across frontier and budget models. Updated with DeepSeek V4, GPT-5.5, and Kimi K2.6.
Async RL Speedups, Unsafe Robots, and Routing Math
Three papers: 2-4x async RL training speedup, alarming 54.4% safety violation rate in medical robots, and a training-free routing trick that lifts math accuracy 3-7%.
DeepSeek V4
DeepSeek V4 ships in two open-weight MoE variants - V4-Pro at 1.6T/49B active and V4-Flash at 284B/13B active - both with 1M-token context and MIT license, released April 24, 2026.
