Tutorials, deep dives and product notes — built for developers.
Anthropic's new Mythos-class Fable 5 (80.3% SWE-bench Pro, $50/1M) vs the outgoing flagship Opus 4.8 (69.2%, $25/1M). Fable 5 dominates every benchmark — but costs 2× more, hallucinates more, and sometimes falls back to Opus 4.8 anyway. Full 30-benchmark comparison.
AI can now generate UML class diagrams, flowcharts, ERDs, and architecture diagrams from your code in under 60 seconds. We break down the three approaches — diagrams-as-code, sandbox execution, and direct image generation — and show which actually produces accurate, production-ready diagrams. 90+ languages supported.
The complete Claude Fable 5 review. Mythos-class for everyone. 80.3% Pro, 88.0% Terminal-Bench, 93.9% Verified. Stripe's 50M-line migration in a day. Karpathy: "major-version-bump-deserving." Simon Willison: "a beast." Safety classifiers, $10/$50 pricing, and why this is the biggest step toward AGI yet.
Claude Fable 5 ($50/1M) vs GPT-5.5 ($30/1M). Fable 5 leads all 8 coding benchmarks (+11.8 avg). GPT-5.5 counters with lower price and Batch/Flex at $15. 5× better Pro value from Fable 5. The definitive head-to-head comparison.
Claude Fable 5 ($50/1M) vs GPT-5.5 Pro ($180/1M). Fable 5 leads all 8 coding benchmarks by +11.8 pts avg. GPT-5.5 Pro fights back on BrowseComp (90.1%) and FrontierMath (39.6%) via parallel compute — but has no published Pro coding scores. Updated with separate GPT-5.5 Pro benchmarks.
Claude Fable 5 leads every benchmark (80.3% Pro, 88.0% Terminal-Bench, ~87% Multi). Now the undisputed #1 for Go coding across all workflows. Updated June 9, 2026.
Claude Fable 5 leads every benchmark (80.3% Pro, 88.0% Terminal-Bench, ~87% Multi). Now the undisputed #1 for all Rust workflows. Updated June 9, 2026.
DeepSeek V4 Flash ($0.28/1M, MIT) vs Gemini 3 Flash ($3.00/1M). Flash leads Pro (+3.0), GPQA (+6.9), MCP Atlas (+7.0). Gemini leads OSWorld (65.1%), multimodal input, and Toolathlon. 10.7× price gap. Two Flash-tier models, zero overlap.
DeepSeek V4 Flash ($0.28/1M, MIT) vs GPT-5.4 Mini ($4.50/1M). Mini leads SWE-bench Pro (+1.8) & Terminal-Bench (+3.1). Flash leads LiveCodeBench (91.6%), HLE (+3.6), and is 16× cheaper. The budget coding tier has never been more competitive.
Terminal-Bench 2.1: DeepSeek V4.1 Flash remains public-board leader at 90.6%. Adds Step 5 Preview at 85.0% as a separately labeled StepFun provider run with API pricing and harness caveats. Updated October 16, 2026.
SWE-bench Pro: Anthropic reports Opus 5.5 at 89.9%, Sonnet 5.5 at 81.3%, and newly added Haiku 5.5 at 64.8%. Vendor results remain separate from Scale's standardized rows. Updated October 16, 2026.
Cut AI coding agent costs by 80-97%. DeepSeek V4 Pro cache hits cost $0.003625/1M with 89.9% hit rate. Tiered model stacks save 94%. Batch APIs, structured prompts, iteration limits, and more — with a real before/after comparison: $8,500 to $235/month.