Chinese AI company 01AI_Yi has released two new code language models, Yi-Coder 1.5B and Yi-Coder 9B, under the Apache 2.0 license. These models, which support 52 major programming languages, offer state-of-the-art performance in code editing, completion, debugging, and math reasoning. The models excel in long-context understanding with a maximum context length of 128K tokens. Yi-Coder 9B, continuously pretrained with 2.4 trillion tokens, outperforms larger models such as DeepSeek-Coder 33B on LiveCodeBench, achieving a 23.4% pass rate. The models are available in both Chat and Base versions.