Anthropic Claude Memory alternatives

Memory tool API + consumer "Memory" feature + Auto Dream consolidation. Document-as-memory rather than extracted-fact-as-memory. Full Anthropic Claude Memory record →

  1. 1 OpenAI Codex (cloud agent) Coding-agent memory

    same storage (file) · same retrieval (extraction-pull, injection) · same memory unit (fact, summary) · also offered managed · also has MCP

    OSS ✓ Self-host ✓ Managed ✓ MCP ✓ ★ 128k released 2026-10-27 Apache-2.0 (Codex CLI; cloud agent proprietary) Compare with Anthropic Claude Memory →

  2. 2 Microsoft Copilot Memory Platform-provider memory

    also in Platform-provider memory · same retrieval (injection) · same memory unit (fact) · also offered managed · also has MCP

    OSS ? Self-host — Managed ✓ MCP ✓ Compare with Anthropic Claude Memory →

  3. 3 OpenAI ChatGPT Memory Platform-provider memory

    also in Platform-provider memory · same retrieval (injection) · same memory unit (fact) · also offered managed · also has MCP

    OSS ? Self-host — Managed ✓ MCP ✓ Compare with Anthropic Claude Memory →

  4. 4 Perplexity Memory Platform-provider memory

    also in Platform-provider memory · same retrieval (injection) · same memory unit (fact) · also offered managed · also has MCP

    OSS ? Self-host — Managed ✓ MCP ✓ Compare with Anthropic Claude Memory →

  5. 5 AGENTS.md File-backed / editor paradigms

    same storage (file) · same retrieval (injection) · same conflict handling (manual)

    OSS ✓ Self-host ✓ Managed ? MCP ? ★ 25k MIT Compare with Anthropic Claude Memory →

  6. 6 claude-mem Claude Code memory mechanisms

    same storage (file) · same retrieval (injection) · same memory unit (summary) · also offered managed · also has MCP

    OSS ✓ Self-host ✓ Managed ✓ MCP ✓ ★ 104k released 2026-10-20 Apache-2.0 Compare with Anthropic Claude Memory →

  7. 7 GitHub Copilot custom instructions File-backed / editor paradigms

    same storage (file) · same retrieval (injection) · same conflict handling (manual) · also offered managed

    OSS ? Self-host — Managed ✓ MCP ? Compare with Anthropic Claude Memory →

  8. 8 Grok Memory (xAI) Platform-provider memory

    also in Platform-provider memory · same retrieval (injection) · same memory unit (fact) · also offered managed

    OSS ? Self-host — Managed ✓ MCP ? Compare with Anthropic Claude Memory →

Ranked by shared memory design (storage, retrieval, conflict handling, memory unit), same section and shared must-haves (open source, self-hosting, MCP), with adoption as a tie-breaker. ✓ confirmed · — no · ? not in the catalog yet. Want picks for your own requirements? Use the chooser. Checking a whole project? Check your stack.