--- title: "openlm vs langstream" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/r2d4-openlm-vs-rogeriochaves-langstream" tools: ["r2d4-openlm", "rogeriochaves-langstream"] --- # openlm vs langstream *GraphCanon updated Aug 15, 2026* ## Verdict Pick openlm if openLM is a flexible Python library designed to interface with various Language Model frameworks similarly to the OpenAI API; pick langstream if langStream is a Python-based tool for building robust Language Model (LLM) applications, emphasizing modularity and composability. [openlm](https://github.com/r2d4/openlm) reports 368 GitHub stars, 22 forks, and 1 open issues, last pushed May 19, 2023. [langstream](https://rogeriochaves.github.io/langstream/) has 417 stars, 28 forks, and 3 open issues, last pushed Jan 3, 2024. Figures are from public GitHub metadata via [openlm's repository](https://github.com/r2d4/openlm) and [langstream's repository](https://github.com/rogeriochaves/langstream). | | [openlm](/tools/r2d4-openlm.md) | [langstream](/tools/rogeriochaves-langstream.md) | | --- | --- | --- | | Tagline | OpenAI-compatible Python client for calling any LLM | Build robust LLM applications with true composability | | Stars | 368 | 417 | | Forks | 22 | 28 | | Open issues | 1 | 3 | | Language | Python | Python | | Adopt for | OpenLM is a flexible Python library designed to interface with various Language Model frameworks similarly to the OpenAI API. | LangStream is a Python-based tool for building robust Language Model (LLM) applications, emphasizing modularity and composability. | | Persona | - | - | | Runtime | - | - | | License | MIT License | MIT | | Categories | LLM Frameworks | Developer Tools, LLM Frameworks | ## Trust and health _Sourced signals - not a safety guarantee. No winner column._ | | [openlm](/tools/r2d4-openlm.md) | [langstream](/tools/rogeriochaves-langstream.md) | | --- | --- | --- | | Days since push | 1184d | 946d | | Open issues (now) | 1 | 3 | | Stars delta | -1 (30d) | Unknown | | Open issues delta | 0 (30d) | Unknown | | Full report | [trust report](/tools/r2d4-openlm/trust.md) | [trust report](/tools/rogeriochaves-langstream/trust.md) | ## Shared compatibility - **Python**: [openlm](/tools/r2d4-openlm.md) - Python runtime; [langstream](/tools/rogeriochaves-langstream.md) - Python runtime ## Decision facts: openlm - **Requirements:** Installation is as simple as using pip to install the openlm package. - **Adopt for:** OpenLM is a flexible Python library designed to interface with various Language Model frameworks similarly to the OpenAI API. - **License detail:** MIT License ## Decision facts: langstream - **Adopt for:** LangStream is a Python-based tool for building robust Language Model (LLM) applications, emphasizing modularity and composability. ## Choose when ### Choose openlm if… - Requirements: Installation is as simple as using pip to install the openlm package.. - Tags unique to openlm: cohere, huggingface, llm, openai. - Use when you want to seamlessly integrate different LLM frameworks, like Hugging Face or Cohere, under a uniform interface similar to OpenAI’s. ### Choose langstream if… - Tags unique to langstream: composability, modular development, python. - Also covers Developer Tools. - LangStream is a Python-based tool for building robust Language Model (LLM) applications, emphasizing modularity and composability. ## When NOT to use openlm - Avoid when you require maximum performance optimization specific to one LLM framework, as using an intermediary library like OpenLM might introduce additional overhead. - Not suitable if you are strictly working with models that do not have Python support or don't fit within the frameworks supported by OpenLM. ## When NOT to use langstream - Last GitHub push was 965 days ago (dormant maintenance, Jan 3, 2024). Validate activity before betting a new project on langstream. - Developer Tools: A gateway is overkill when you're pinned to a single provider and model. - LLM Frameworks: Avoid a framework for a single prompt-and-retrieve call; the abstraction can cost more than it saves. ## Common questions ### What is the difference between openlm and langstream? openlm: OpenAI-compatible Python client for calling any LLM. langstream: Build robust LLM applications with true composability. See the comparison table for live GitHub stats and shared categories. ### When should I choose openlm over langstream? Choose openlm over langstream when Requirements: Installation is as simple as using pip to install the openlm package.; Tags unique to openlm: cohere, huggingface, llm, openai; Use when you want to seamlessly integrate different LLM frameworks, like Hugging Face or Cohere, under a uniform interface similar to OpenAI’s. ### When should I choose langstream over openlm? Choose langstream over openlm when Tags unique to langstream: composability, modular development, python; Also covers Developer Tools; LangStream is a Python-based tool for building robust Language Model (LLM) applications, emphasizing modularity and composability. ### When should I avoid openlm? Avoid when you require maximum performance optimization specific to one LLM framework, as using an intermediary library like OpenLM might introduce additional overhead. Not suitable if you are strictly working with models that do not have Python support or don't fit within the frameworks supported by OpenLM. ### When should I avoid langstream? Last GitHub push was 965 days ago (dormant maintenance, Jan 3, 2024). Validate activity before betting a new project on langstream. Developer Tools: A gateway is overkill when you're pinned to a single provider and model. LLM Frameworks: Avoid a framework for a single prompt-and-retrieve call; the abstraction can cost more than it saves. ### Is openlm or langstream more popular on GitHub? langstream has more GitHub stars (417 vs 368). Stars measure visibility, not whether either tool fits your constraints. ### Are openlm and langstream open source? Yes - both are open-source projects on GitHub (openlm: MIT, langstream: MIT). ### Where can I find alternatives to openlm or langstream? GraphCanon lists graph-backed alternatives at [openlm alternatives](/tools/r2d4-openlm/alternatives) and [langstream alternatives](/tools/rogeriochaves-langstream/alternatives) ([openlm markdown twin](/tools/r2d4-openlm/alternatives.md), [langstream markdown twin](/tools/rogeriochaves-langstream/alternatives.md)), ranked by typed relationship edges rather than popularity votes. ### Is there a machine-readable version of this comparison? Yes. The markdown twin at [this comparison](/compare/r2d4-openlm-vs-rogeriochaves-langstream.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, openlm or langstream? openlm: Dormant. langstream: Dormant. Compare maintenance labels, days since push, and release cadence in the trust section below - stars alone do not measure maintenance. ### Where are the full trust reports for openlm and langstream? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [openlm trust report](/tools/r2d4-openlm/trust); [langstream trust report](/tools/rogeriochaves-langstream/trust). --- **Machine-readable endpoints** - JSON: [`/api/graphcanon/graph?tool=r2d4-openlm`](/api/graphcanon/graph?tool=r2d4-openlm) - LLM index: [/llms.txt](/llms.txt) - Full corpus: [/llms-full.txt](/llms-full.txt) _GraphCanon - The knowledge graph for AI development. https://www.graphcanon.com/_