ToolTier blog
Explainers on the AI tools we rank: what new models and plans actually cost, what changed, and how to use them well. Every fact is checked against the vendor's own pages and dated.
- · News · Coding · AgentsThis week in AI tools: GitHub Copilot Fusion, Claude API changes, Replit Cloud Agents and Runway Dev plugins
GitHub Copilot Fusion goes GA and Agent Merge reaches pull requests, Claude's API gets message threads and 128 MB requests, plus Replit Cloud Agents, Runway Dev plugins, Lovable imports and Suno MCP.
- · Pricing · Claude · ChatGPT · Weekly checkAI tool pricing changes this week: Claude Max becomes Ultra, ChatGPT Pro adds API credits, Copilot joins GitHub Enterprise
Our Nov 2, 2026 check of 146 AI tools: Claude Max 20x renamed Ultra, ChatGPT Pro and Business get API credits, GitHub Enterprise includes Copilot, Roomote drops Cloud.
- · Claude Code · Agent Skills · Subagents · How-toClaude Code skills vs subagents vs CLAUDE.md: which one to use for what
When to put instructions in CLAUDE.md, a skill (SKILL.md) or a subagent in Claude Code: what each one costs in context, who triggers it, and how they combine. Checked against Anthropic's docs on Oct 29, 2026.
- · News · Models · CodingThis week in AI tools: GPT-6.1 Terra, Kimi K3.1 Pro, Claude Duet and Runway App Studio
OpenAI's GPT-6.1 Terra lands at $1 / $5 per 1M tokens and in GitHub Copilot, Kimi K3.1 Pro arrives as K2 retires, plus Claude Duet, Agent Skills at AAIF and Runway App Studio.
- · Pricing · Code review · Weekly checkAI tool pricing changes this week: Greptile drops seats, Synthesia cuts Starter, Chroma Cloud closes
Our Oct 26, 2026 check of 146 AI tools: Greptile goes usage-based, Synthesia Starter drops to $19, Chroma Cloud shuts down, OpenAI retires audio models.
- · AGENTS.md · CLAUDE.md · Cursor rules · How-toAGENTS.md vs CLAUDE.md vs Cursor rules vs copilot-instructions.md: which file each coding agent reads
Where Cursor, Claude Code, OpenAI Codex, GitHub Copilot and Gemini CLI look for project instructions, how they handle AGENTS.md, and a one-source-of-truth setup that works across all five. Checked against each vendor's docs on Oct 22, 2026.
- · Gemini · Pricing · Coding agentsGemini 4 Argon pricing: every way to use it for coding (API, Copilot, Cursor, Devin Desktop)
Gemini 4 Argon launched Oct 13, 2026. What it costs in the Gemini API before and after Nov 30, and how GitHub Copilot, Cursor, Devin Desktop, the Gemini app and Antigravity charge for it. Checked against official pages on Oct 20, 2026.
