Use StarCoder 15B for Free

StarCoder 15B is an AI model released May 2023 by bigcode, a leading organization in large language model research. Original BigCode StarCoder 15B trained on permissively-licensed GitHub code — strong at completion, docstring generation, and refactoring. With 15.5B and a 8K tokens context window, StarCoder 15B is designed to excel across a range of demanding tasks — from software engineering and mathematical problem-solving to multilingual content generation and long-document analysis.

StarCoder 15B uses a dense transformer architecture with 15.5B of parameters, all of which are active for every input token. Dense architectures provide predictable, consistent behavior across diverse task types — there are no "cold" experts to warm up, and quality is uniform across prompts. bigcode's training pipeline combined large-scale pretraining on The Stack — 35B tokens of permissively licensed code with supervised fine-tuning and alignment techniques (RLHF or DPO), producing StarCoder 15B's characteristic balance of capability, helpfulness, and safety.

As of 2026-10-16, StarCoder 15B by bigcode demonstrates measurable performance on standard AI evaluation benchmarks. On HumanEval — which tests ability to write correct functions from docstrings — it achieves 33.6%. For software engineering tasks, StarCoder 15B scores 33.6% on HumanEval, which tests ability to write correct functions from docstrings. These scores place StarCoder 15B — at 15.5B of parameters — in a competitive position within its model class. Note that benchmark scores reflect controlled evaluation conditions; real-world performance varies by task, prompt design, and domain specificity.

The primary strengths of StarCoder 15B are: Pioneered ethical code AI — first with developer opt-out; 80+ programming languages; OpenRAIL-M license. These make it particularly well-suited for Legacy StarCoder integrations, Research on code model generations. Users working on complex, multi-step problems benefit most from StarCoder 15B's ability to maintain coherence across long inputs and produce structured, verifiable outputs.

Like all current AI systems, StarCoder 15B has limitations: Superseded by StarCoder2, Codestral, Qwen2.5-Coder; 8K context; Knowledge cutoff 2023. For production deployments, validating outputs against authoritative sources — especially for domain-specific or time-sensitive information — remains best practice. bigcode continues to improve StarCoder 15B through ongoing research.

StarCoder 15B is available on LITHOVEX AI with a free account. Unlike direct API access — which requires billing setup, API key management, and per-token charges — LITHOVEX AI provides a seamless browser interface with no setup required, making StarCoder 15B accessible to students, researchers, developers, and early-stage teams globally.

As of 2026-10-16, StarCoder 15B by bigcode demonstrates measurable performance on standard AI evaluation benchmarks. On HumanEval — which tests ability to write correct functions from docstrings — it achieves 33.6%. For software engineering tasks, StarCoder 15B scores 33.6% on HumanEval, which tests ability to write correct functions from docstrings. These scores place StarCoder 15B — at 15.5B of parameters — in a competitive position within its model class. Note that benchmark scores reflect controlled evaluation conditions; real-world performance varies by task, prompt design, and domain specificity.

Dense transformer, 15.5B, Multi-Query Attention, FIM

The training pipeline for StarCoder 15B involves multiple stages: large-scale pretraining on The Stack — 35B tokens of permissively licensed code to develop broad world knowledge, followed by supervised fine-tuning on instruction-response pairs, and alignment techniques such as RLHF or DPO. Each stage refines the model's helpfulness, accuracy, and safety. bigcode's research team — based in International — has optimized StarCoder 15B for the specific capability profile described above.

Inference efficiency: StarCoder 15B at 15.5B is designed to deliver quality outputs at practical serving speeds. Its 8K tokens context window enables processing entire documents, multi-file codebases, and extended conversation histories — particularly valuable for contract review, technical documentation analysis, and codebase-level AI assistance.

Getting started with StarCoder 15B on LITHOVEX AI takes under two minutes. Follow these steps:

For best results with StarCoder 15B: provide specific, context-rich prompts; include examples when generating code; specify output format when structure matters; break complex tasks into focused sub-questions.

BigCode is an open scientific collaboration led by Hugging Face and ServiceNow, bringing together researchers to develop open and responsible AI for code. The StarCoder model family is trained on The Stack — a large collection of permissively licensed source code from GitHub covering hundreds of programming languages. BigCode follows a governance model addressing ethical concerns in code AI, including opt-out mechanisms for developers. StarCoder2 15B, released in 2024, became one of the most capable open code generation models, with strong multi-language performance and fill-in-the-middle completion used in IDE integrations.

Funding: Open science collaboration (Hugging Face + ServiceNow)

Founded: 2022, headquartered in International.

Visit the official bigcode website →

StarCoder 15B by bigcode competes in a field with several strong alternatives. Below is a detailed side-by-side comparison against commonly listed alternatives, using benchmark data and capability profiles in the catalog.

Both StarCoder 15B and the models above are available free on LITHOVEX AI — test them side by side on your real tasks before committing to a subscription with any provider.

StarCoder 15B is released under BigCode OpenRAIL-M, which means you can download and run it on your own hardware. Below are the quickest ways to get started.

StarCoder's May 2023 release was a landmark for open-source coding AI globally, demonstrating that high-quality code models could be trained responsibly with opt-out rights for developers. It established BigCode's model of ethical AI training that influenced subsequent open code models.

StarCoder 15B by bigcode has the following version history and notable updates:

For the complete changelog and latest release notes, visit the official bigcode model page.