Benchmark-backed ChatGPT alternatives ranked by performance, price, context window, and open-weight availability.
Most ChatGPT alternative searches are really about tradeoffs: lower cost, better coding, or more deployment control. BenchLM ranks alternatives against a tracked OpenAI reference using benchmark performance first, then token price, context window, and open-weight availability.
BenchLM uses GPT-5.5 as the tracked OpenAI reference for ChatGPT-like performance.
Direct answer
DeepSeek V4 Pro (Max) is a strong ChatGPT alternative. It retains about 96% of GPT-5.5's general use benchmark profile. Its blended token price is about 86% lower than GPT-5.5. It is also open-weight, so you can self-host or fine-tune it.
DeepSeek · Open Weight · 1M context
DeepSeek V4 Pro (Max) is a strong ChatGPT alternative. It retains about 96% of GPT-5.5's general use benchmark profile. Its blended token price is about 86% lower than GPT-5.5. It is also open-weight, so you can self-host or fine-tune it.
BenchLM fit
88.8
Score vs ref
96%
Token cost
86% cheaper
Google · Proprietary · 1M context
Gemini 3.1 Pro is a strong ChatGPT alternative. It beats GPT-5.5 on BenchLM's general use score. Its blended token price is about 60% lower than GPT-5.5.
BenchLM fit
87.9
Score vs ref
101%
Token cost
60% cheaper
H Company · Proprietary · 64K context
Holo3-122B-A10B is a strong ChatGPT alternative. It beats GPT-5.5 on BenchLM's general use score. Its blended token price is about 90% lower than GPT-5.5.
BenchLM fit
86
Score vs ref
~110%
Token cost
90% cheaper
Anthropic · Proprietary · 1M context
Claude Opus 4.8 is a strong ChatGPT alternative. It beats GPT-5.5 on BenchLM's general use score.
BenchLM fit
85.9
Score vs ref
104%
Token cost
15% cheaper
Google · Proprietary · 1M context
Gemini 3.5 Flash is a strong ChatGPT alternative. It retains about 96% of GPT-5.5's general use benchmark profile. Its blended token price is about 70% lower than GPT-5.5.
BenchLM fit
85.9
Score vs ref
96%
Token cost
70% cheaper
MiniMax · Open Weight · 1M context
MiniMax M3 is a strong ChatGPT alternative. It still posts a credible 76 score for general use work on BenchLM. Its blended token price is about 96% lower than GPT-5.5. It is also open-weight, so you can self-host or fine-tune it.
BenchLM fit
83.2
Score vs ref
84%
Token cost
96% cheaper
BenchLM does not treat an alternative query like a generic leaderboard. This page starts from the tracked GPT-5.5 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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DeepSeek V4 Pro (Max) is the current top pick on this page. It scores 87 in the selected BenchLM use-case weighting and 96% of GPT-5.5's benchmark profile, with 86% cheaper as the pricing summary.
Qwen3.6-27B 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-5.5 reference.
Yes. DeepSeek V4 Pro (Max) is the strongest open-weight option on this page. BenchLM surfaces it because it combines self-hostable deployment with a 87 weighted score and 1M of context.
BenchLM uses GPT-5.5 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.