OpenAI Codex (cloud agent) alternatives

Memory under ~/.codex/memories/ : summaries, durable entries, recent-input logs, supporting evidence — generated in background after sessions go idle. Chronicle (opt-in macOS preview) uses screen-capture to seed memory. Off by default; opt-in via config.toml . Full OpenAI Codex (cloud agent) record →

  1. 1 Aider Coding-agent memory

    also in Coding-agent memory · same storage (file) · same retrieval (injection) · same memory unit (episode) · also open source · also self-hostable

    OSS ✓ Self-host ✓ Managed — MCP — ★ 41k released 2026-02-12 Apache-2.0 Compare with OpenAI Codex (cloud agent) →

  2. 2 Gemini CLI memory (save_memory / GEMINI.md) Coding-agent memory

    also in Coding-agent memory · same storage (file) · same retrieval (injection) · same memory unit (fact) · also open source · also self-hostable · also has MCP

    OSS ✓ Self-host ✓ Managed ? MCP ✓ ★ 108k released 2026-10-21 Apache-2.0 Compare with OpenAI Codex (cloud agent) →

  3. 3 claude-mem Claude Code memory mechanisms

    same storage (file) · same retrieval (injection) · same memory unit (summary, episode) · also open source · also self-hostable · also offered managed · also has MCP

    OSS ✓ Self-host ✓ Managed ✓ MCP ✓ ★ 104k released 2026-10-20 Apache-2.0 Compare with OpenAI Codex (cloud agent) →

  4. 4 Mistral Vibe (Remote Agents) + Mistral Medium 3.5 Coding-agent memory

    also in Coding-agent memory · same retrieval (injection) · same memory unit (episode) · also open source · also self-hostable · also offered managed · also has MCP

    OSS ✓ Self-host ✓ Managed ✓ MCP ✓ ★ 4.9k released 2026-10-20 Apache-2.0 (Vibe CLI); Modified MIT (Medium 3.5… Compare with OpenAI Codex (cloud agent) →

  5. 5 Devin (Cognition) Coding-agent memory

    also in Coding-agent memory · same storage (file) · same retrieval (injection, extraction-pull) · same memory unit (fact) · also self-hostable · also offered managed · also has MCP

    OSS ? Self-host ✓ Managed ✓ MCP ✓ Compare with OpenAI Codex (cloud agent) →

  6. 6 Ratine Memory observability & monitoring

    same storage (file) · same retrieval (extraction-pull) · same memory unit (fact) · also open source · also self-hostable · also has MCP

    OSS ✓ Self-host ✓ Managed — MCP ✓ ★ 1 released 2026-04-02 MIT Compare with OpenAI Codex (cloud agent) →

  7. 7 Anthropic Claude Memory Platform-provider memory

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

    OSS ? Self-host — Managed ✓ MCP ✓ Compare with OpenAI Codex (cloud agent) →

  8. 8 Browserbase Browser-agent memory

    same storage (file) · same retrieval (extraction-pull) · same memory unit (episode) · also offered managed · also has MCP

    OSS ? Self-host — Managed ✓ MCP ✓ Compare with OpenAI Codex (cloud agent) →

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.