Release5d ago
Suhail launches Particle and its first model, Particle-1: a DeepSeek V4.1 Flash post-train that uses about 45% fewer tokens on coding tasks
On Oct 28, Mixpanel founder Suhail Doshi announced his new company Particle on X, with its first model, Particle-1, live now. Particle's blog says it is a reinforcement-learning post-train of DeepSeek V4.1 Flash that uses 28.4% to 52.2% fewer output tokens and costs 34.4% to 51.6% less per task across four coding and data engineering benchmarks, with pass rates inside the base model's confidence intervals. It is available through the Particle API, OpenRouter and Vercel AI Gateway; Particle's docs list $0.25 input and $1.00 output per million tokens with a 1,048,576-token context window.
Benchmark58d ago
LMArena: Claude Fable 5.1 (Max) #1 on Agent Arena (+15.8% net) at $4.14 median cost/task
Arena.ai says Anthropic Claude Fable 5.1 (Max) is #1 on Agent Arena across 6.7k+ real-world long-horizon agentic sessions with +15.8% net improvement, redrawing the price-performance frontier at a $4.14 median cost/task. Implicit praise-vs-complaint leads by +42.5%, confirmed success +22.4%, bash recovery +13.1%, and no tool hallucinations; GPT-6 Astra traces are still coming in.
Benchmark1d ago
SemiAnalysis releases GDPx, an agentic benchmark of 206 tasks across 11 high-value domains where the top model, Claude Opus 5.5, scores just 12%
On Nov 2, semiconductor and AI research firm SemiAnalysis released GDPx, a benchmark of agentic capability across 11 domains: chip design, cybersecurity, biology, finance, legal, quant trading, recursive self-improvement (RSI), hardware design, materials science, alignment and software engineering. Its 206 tasks were built by 14 specialist data partners, with SemiAnalysis doing final QA. On the official leaderboard Claude Opus 5.5 leads at 12.0%, followed by Gemini 4 Carbon at 10.9% and GPT-6 Astra at 9.6%; nearly every model scores 0 on finance and legal. SemiAnalysis says safety classifiers drag down Opus 5.5 and GPT-6 Astra, and plans a new version every 3–6 months. All scores are as reported by SemiAnalysis.
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