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The Substrate blog

Field notes from Pavel on working with AI agents, keeping their context, and building Substrate.

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CodexClaude CodeAgents Md

Codex vs Claude Code: which should you use, and how do you use both?

Codex vs Claude Code as of November 2026: plans, AGENTS.md vs CLAUDE.md, MCP config, memory, and how to run both on one project.

Nov 9, 20266 min read

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ChatGPT memory vs Substrate: when the built-in memory is enough

An honest comparison by Substrate: when ChatGPT's built-in memory is enough, when it isn't, and how ChatGPT connects to Substrate as a custom MCP connector.

Nov 5, 20265 min read

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Claude's built-in memory vs Substrate: is the built-in memory enough?

Claude's built-in memory vs Substrate, written by Substrate: when the built-in memory is enough, when it isn't, and a three-question test.

Nov 5, 20266 min read

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Supermemory alternatives: Substrate vs Supermemory, where each wins

Substrate and Supermemory are different products. Where each one wins, plus pricing, MCP, Claude Code and open source, checked November 2026.

Nov 5, 20266 min read

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Zep alternatives: Substrate vs Zep, where each one wins

An honest comparison of Substrate and Zep by Substrate: pricing, open source, agents and sources, and when to choose each.

Nov 5, 20267 min read

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ClaudeChatgptAgent Memory

Claude vs ChatGPT: which is better?

ChatGPT is the safer default, Claude is stronger for writing and long documents. The part nobody covers: carrying context between them.

Nov 5, 20264 min read

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Mem0 alternatives: Substrate vs Mem0, where each one wins

An honest comparison of Substrate and Mem0 by Substrate: pricing, open source, agents and sources, a benchmark with caveats, and when to choose each.

Nov 5, 20267 min read

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Does Claude have memory? What it remembers and what it can't carry

What Claude remembers, where it is stored, how to edit it, and what it cannot carry to other tools, as of November 2026.

Nov 5, 20266 min read

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CursorClaude CodeAgents Md

How to share context between Claude and Cursor

Claude Code and Cursor share no chat history. See what they do share, with file paths, and a ten-minute setup for teams running many agents.

Nov 5, 20266 min read

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Claude CodeMemoryClaude Md

How does memory work in Claude Code?

How Claude Code memory works: CLAUDE.md levels and load order, auto memory, imports, what survives /compact, and how to keep it useful as you grow.

Nov 5, 20268 min read

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MCPMemoryClaude Code

MCP memory: what it is, how to set it up, how to choose

What an MCP memory server is, real Claude Code and Cursor config for the official one, and how it compares with four alternatives.

Nov 5, 20269 min read

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