Best OpenAI primary source: OpenAI compare models. Official OpenAI model comparison page. Use it before swapping OpenAI models in coding, agent, or product workflows.
Best Claude primary source: Claude choosing a model. Official Anthropic model-selection guidance. Use it to compare speed, capability, and cost across Claude model families.
Best Gemini model table: Gemini API models. Official Google AI for Developers model reference. Use it when Gemini model IDs, modalities, or release channels are moving quickly.
Best fast-moving migration signal: DeepSeek models and pricing. Official DeepSeek model and pricing page. Use it when you need to see current alias migrations, pricing, and V4 Flash mode changes directly from the source.
Best multi-provider catalog: OpenRouter models guide. OpenRouter catalog for comparing model families across providers. Use it when you need a broad view before testing prompts yourself.
Best live market signal: OpenRouter Rankings. OpenRouter's live rankings and usage page. Use it to see which routed frontier models are attracting real usage before deciding what to benchmark yourself.
Model selection needs tests, not vibes
Frontier model comparisons change constantly, and generic leaderboards rarely match your product. The right process is to start with official model docs, choose two or three candidates, and test them on your actual tasks.
Right now the official docs are especially useful because they surface concrete shifts: OpenAI's September 3 GPT-6 Astra launch and model guide add async tool calls, mid-turn steering, new reasoning controls, and a premium option for difficult coding, computer-use, research, and document workflows, while GPT-5.6 Terra and Luna remain important cost-sensitive choices; Anthropic's live overview centers the September 1 Claude Fable 5.1 release for demanding long-horizon work; Gemini's docs now add the September 2 GA Gemini 3.8 Flash model for long-horizon coding and autonomous agents alongside the Interactions API and managed agents; xAI pairs Grok 4.6 with Context Compaction and Priority Processing; and DeepSeek's pricing plus vision docs explain the current V4 Flash family. Start with those primary sources, use Simon Willison's Astra note for an independent benchmark check, then run your own evals for quality, latency, cost, tool use, structured output, and failure behavior.
Do not migrate because a model is famous
A stronger model on paper can be worse for a workflow if it is slower, more expensive, weaker at structured output, less reliable with tools, or harder to operate within your system. Model choice is an engineering and product decision.
The best resources for this topic are primary sources and repeatable tests. Blog posts and screenshots can be useful for discovery, but production migration should depend on current docs and your own task set.
Recommended courses and resources
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Claude Code 2.1.313 Cursor backdoor response guide
AI developer-tool supply chain incident · Cursor · Intermediate to advanced
Use this if Claude Code for VS Code may have updated through Cursor's marketplace on October 29, 2026.
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Embedded browser flaws in five AI coding assistants
AI coding assistant security analysis · Forever Security · Intermediate to advanced
Use this if your team previews local HTML or browses from an AI coding assistant. Check patch status, trusted projects and credential exposure before continuing.
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Gemini 4 Carbon cyberdefense launch guide
Frontier model and cybersecurity launch analysis · Google DeepMind · Intermediate to advanced
Use this to assess Gemini 4 Carbon's reported cyber capabilities, limited rollout and evidence requirements before planning a production evaluation.
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Claude exploit-chain research explained
AI-assisted vulnerability research analysis · Anthropic · Intermediate to advanced
Use this after Anthropic's October 27, 2026 disclosure to verify the five public patch records and prioritize browser and operating-system updates.
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Anthropic IPO filing explained
AI company analysis · Learnetto · Intermediate
You want the confirmed numbers, governance structure and customer implications in Anthropic's public IPO filing without treating an incomplete prospectus as a finished offering.
