Open-source and open-weight ChatGPT alternatives ranked by benchmark performance, coding strength, and deployment flexibility.
Open source ChatGPT alternative queries are a better fit for BenchLM than generic chatbot roundups because the real decision is not just interface parity. It is which self-hostable models still hold up on coding, reasoning, and research benchmarks.
BenchLM uses GPT-5.4 as the tracked OpenAI reference for ChatGPT-like performance.
Direct answer
Qwen3.5 397B is a strong ChatGPT alternative. It still posts a credible 54 score for general use work on BenchLM. Its blended token price is about 100% lower than GPT-5.4. It is also open-weight, so you can self-host or fine-tune it.
Alibaba · Open Weight · 128K context
Qwen3.5 397B is a strong ChatGPT alternative. It still posts a credible 54 score for general use work on BenchLM. Its blended token price is about 100% lower than GPT-5.4. It is also open-weight, so you can self-host or fine-tune it.
BenchLM fit
78
Score vs ref
77%
Token cost
100% cheaper
Zhipu AI · Open Weight · 200K context
GLM-5 is a strong ChatGPT alternative. It still posts a credible 54 score for general use work on BenchLM. Its blended token price is about 100% lower than GPT-5.4. It is also open-weight, so you can self-host or fine-tune it.
BenchLM fit
77.2
Score vs ref
77%
Token cost
100% cheaper
Alibaba · Open Weight · 1M context
Qwen2.5-1M is a strong ChatGPT alternative. It still posts a credible 43 score for general use work on BenchLM. Its blended token price is about 100% lower than GPT-5.4. It is also open-weight, so you can self-host or fine-tune it.
BenchLM fit
76.9
Score vs ref
61%
Token cost
100% cheaper
NVIDIA · Open Weight · 10M context
Nemotron 3 Ultra 500B is a strong ChatGPT alternative. It still posts a credible 37 score for general use work on BenchLM. Its blended token price is about 100% lower than GPT-5.4. It is also open-weight, so you can self-host or fine-tune it.
BenchLM fit
74.3
Score vs ref
53%
Token cost
100% cheaper
DeepSeek · Open Weight · 128K context
DeepSeek Coder 2.0 is a strong ChatGPT alternative. It still posts a credible 43 score for general use work on BenchLM. Its blended token price is about 92% lower than GPT-5.4. It is also open-weight, so you can self-host or fine-tune it.
BenchLM fit
72.3
Score vs ref
61%
Token cost
92% cheaper
NVIDIA · Open Weight · 1M context
Nemotron 3 Super 100B is a strong ChatGPT alternative. It still posts a credible 33 score for general use work on BenchLM. Its blended token price is about 100% lower than GPT-5.4. It is also open-weight, so you can self-host or fine-tune it.
BenchLM fit
72.1
Score vs ref
47%
Token cost
100% cheaper
BenchLM does not treat an alternative query like a generic leaderboard. This page starts from the tracked GPT-5.4 reference, then weights benchmark quality, token cost, context window, and deployment model to find realistic replacements.
That means a model can outrank the absolute leaderboard leader here if it stays close enough on benchmarks while being materially cheaper, more open, or better matched to the workflow implied by the query.
Change the goal, use case, or minimum context if this landing page is close but not exact.
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Qwen3.5 397B is the current top pick on this page. It scores 54 in the selected BenchLM use-case weighting and 77% of GPT-5.4's benchmark profile, with 100% cheaper as the pricing summary.
Qwen3.5 397B is the best low-cost candidate surfaced by this page. It ranks as a serious replacement while landing at 100% cheaper than the tracked GPT-5.4 reference.
Yes. Qwen3.5 397B is the strongest open-weight option on this page. BenchLM surfaces it because it combines self-hostable deployment with a 54 weighted score and 128K of context.
BenchLM uses GPT-5.4 as the tracked ChatGPT reference here, then scores alternatives from benchmark performance first. Token cost, context window, and open-weight preference are used to break ties and surface better real-world replacements rather than just the raw leaderboard winner.