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-5.4 as the tracked OpenAI reference for ChatGPT-like performance.
Direct answer
Gemini 3.1 Pro is a strong ChatGPT alternative. It beats GPT-5.4 on BenchLM's general use score. Its blended token price is about 65% lower than GPT-5.4.
Google · Proprietary · 1M context
Gemini 3.1 Pro is a strong ChatGPT alternative. It beats GPT-5.4 on BenchLM's general use score. Its blended token price is about 65% lower than GPT-5.4.
BenchLM fit
88.6
Score vs ref
101%
Token cost
65% cheaper
Alibaba · Proprietary · 1M context
Qwen3.6 Plus is a strong ChatGPT alternative. It still posts a credible 77 score for general use work on BenchLM. Its blended token price is about 100% lower than GPT-5.4.
BenchLM fit
81.7
Score vs ref
83%
Token cost
100% cheaper
xAI · Proprietary · 2M context
Grok 4.20 is a strong ChatGPT alternative. It still posts a credible 77 score for general use work on BenchLM. Its blended token price is about 57% lower than GPT-5.4. It adds a larger 2M context window than the tracked ChatGPT reference.
BenchLM fit
78.5
Score vs ref
83%
Token cost
57% cheaper
Anthropic · Proprietary · 1M context
Claude Mythos Preview is a strong ChatGPT alternative. It beats GPT-5.4 on BenchLM's general use score. It is pricier than GPT-5.4, so the case depends on quality or context-window needs.
BenchLM fit
77.4
Score vs ref
106%
Token cost
747% pricier
Xiaomi · Proprietary · 1M context
MiMo-V2-Pro is a strong ChatGPT alternative. It retains about 90% of GPT-5.4's general use benchmark profile.
BenchLM fit
77.3
Score vs ref
~90%
Token cost
Pricing varies
Z.AI · Open Weight · 203K context
GLM-5.1 is a strong ChatGPT alternative. It retains about 90% of GPT-5.4's general use benchmark profile. Its blended token price is about 68% 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
90%
Token cost
68% 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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Gemini 3.1 Pro is the current top pick on this page. It scores 94 in the selected BenchLM use-case weighting and 101% of GPT-5.4's benchmark profile, with 65% cheaper as the pricing summary.
Qwen3.6 Plus 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. GLM-5.1 is the strongest open-weight option on this page. BenchLM surfaces it because it combines self-hostable deployment with a 84 weighted score and 203K 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.