Blog

Notes on open-source AI, model launches, and the tools we build at ChatOSS.

September 21, 202611 min read

GLM 5.3 Flash vs. DeepSeek V4.1 Flash: which is better at agentic coding?

Both labs ship a million-token context, MIT weights, and a ~$0.15-per-million price tag. On the independent harnesses that have actually run both models — vals.ai's Vibe Code Bench and Terminal-Bench 2.1, BenchLM's Vibe Code Bench 1-100, and Artificial Analysis' v4.3 index — DeepSeek V4.1 Flash wins agentic coding, and by a wider margin than either vendor's own table suggests.

GLM 5.3 FlashDeepSeek V4.1 FlashAgentic CodingBenchmarksCost per TaskOpen Weight

September 10, 20269 min read

DeepSeek V4.1 Flash: Opus 5-tier agentic coding at 1/33 the price

DeepSeek's new ~748B-parameter Flash model (552B backbone + 196B Engram memory) retires V4 Pro, ships native vision, and — on DeepSeek's own max-effort numbers — edges Claude Opus 5 and GPT-5.6 Sol on Terminal-Bench 2.1 and DeepSWE v1.1 while costing $0.15/$0.60 per million tokens. Full benchmark table, pricing math, and where the closed frontier still wins.

DeepSeek V4.1 FlashClaude Opus 5GPT-5.6 SolBenchmarksOpen Weight

August 31, 202612 min read

GLM-5.3 and GLM-5.3 Flash: Z.ai's one-two punch matches Claude and GPT at a tenth of the price

Z.ai shipped a post-trained flagship (GLM-5.3) and a brand-new 320B multimodal sibling (GLM-5.3 Flash) two weeks apart. We benchmark both against Claude Opus 5, Fable 5, and GPT-5.6 Sol — with charts, a comparison table, and the pricing math.

GLM-5.3GLM-5.3 FlashClaude Opus 5GPT-5.6 SolBenchmarksOpen Weight

August 14, 20266 min read

One hour on DeepSeek V4 Pro cost $0.28. The same hour on Claude and ChatGPT: 68–136× more.

31.2 million input tokens, 107K output tokens, 157 API calls — and 28 cents. Here's the real billing-log breakdown, what the identical token volume would have cost on Claude Opus 5, GPT-5.6 Sol, and Claude Fable 5, and the two numbers I had wrong before I checked.

DeepSeek V4 ProGPT-5.6 SolClaude Opus 5Prompt CachingCost

August 13, 20268 min read

DeepSeek V4 Pro 0813: frontier-class benchmarks at 100× less than Opus 5

DeepSeek's flagship just went GA — and on SWE-bench Verified its open-weight scores match Anthropic's closed frontier while costing 10–100× less per task. Here's the full head-to-head with Opus 5, Fable 5, and GPT-5.6 Sol, with a price-vs-intelligence chart and comparison table.

DeepSeek V4 ProClaude Opus 5GPT-5.6 SolBenchmarksOpen Weight

August 5, 20267 min read

Did DeepSeek V4 Flash just dethrone GLM 5.2?

DeepSeek V4 Flash costs 10× less than GLM-5.2 and matches or beats it on several coding benchmarks. But GLM-5.2 still leads on broad intelligence and reasoning. Here’s the full head-to-head with charts and a comparison table.

DeepSeek V4 FlashGLM-5.2BenchmarksComparisonOpen Source

July 20, 20266 min read

Ollama Cloud shut down new Max plans — and Kimi K3 is melting the servers

Ollama paused new $100/mo Max subscriptions because cloud token volume is doubling every month. Kimi K3 just landed on the platform, GLM-5.2 forced a GPU doubling, and even Max users hit an “extra usage only” wall. Here's what's happening.

OllamaOllama CloudKimi K3GLM-5.2Open Source

July 20, 20267 min read

Kimi K3 vs. Fable 5 vs. GPT-5.6 Sol: the benchmark showdown

Three frontier models, one week of launches. We stack Kimi K3's open-weight numbers against Anthropic's Claude Fable 5 and OpenAI's GPT-5.6 Sol across intelligence, coding, context, and price — with charts.

Kimi K3Claude Fable 5GPT-5.6 SolBenchmarksComparison

July 20, 20264 min read

Is Kimi K3 down?

Moonshot AI's breakout open model isn't offline — but a record-breaking launch has pushed its compute to the limit, and new subscriptions are paused. Here's what's actually happening.

Kimi K3Moonshot AIOutageOpen Source