Mistral AI vs Nous Hermes vs OpenChat vs Zephyr
A side-by-side look at scores, pricing and features — with RECATOOLS' ASEAN-aware verdict for each.
Mistral AI
European frontier-model lab
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Nous Hermes
Nous Research's open Hermes models — steerable, minimally filtered
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OpenChat
C-RLFT-tuned open 7B that once matched ChatGPT on benchmarks
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Zephyr
HuggingFace's instruction-tuned open-source chat model — direct, helpf...
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| RECATOOLS Score | 8.4 / 10 | 6.8 / 10 | 6.3 / 10 | 5.8 / 10 |
| Capability | ||||
| Value for money | ||||
| Ease of use | ||||
| ASEAN readiness | ||||
| API quality | ||||
| Pricing | Freemium | Open Source | Open Source | Open Source |
| Free tier | Free open-weight models for self-hosting | Fully free | Fully free | Fully free |
| Paid from | $0.14/1M tokens (Mistral Small via API) | — | — | — |
| Has API | ✓ | ✓ | ✓ | ✓ |
| Open source | ✓ | ✓ | ✓ | ✓ |
| Free to use | ✓ | ✓ | ✓ | ✓ |
| Users | 500k+ API users | 500k+ downloads | 200k+ downloads | 500k+ downloads |
| Founded | 2023 | 2023 | 2023 | 2023 |
| Maker | Arthur Mensch, Guillaume Lample, Timothee Lacroix | Nous Research Community | Tsinghua University | Hugging Face |
| Verdict | Mistral is the strongest European alternative to the US labs, and its open-weight releases are the reason: Mistral Large 3 (December 2025) ships as a 675B-parameter MoE under Apache 2.0 with a 256K context window, Medium... |
The Hermes series is the closest thing open-source AI has to a house brand: Llama- and Mistral-based fine-tunes known for strong instruction-following, steerability and refusal rates far below the big labs' defaults. Her... |
OpenChat earned its reputation honestly: the 7B OpenChat 3.5 traded blows with early-2023 ChatGPT on public benchmarks thanks to C-RLFT, a training method that squeezes signal out of mixed-quality data, all under Apache... |
Zephyr-7B-beta is a research-grade open model from HuggingFace's H4 team: a Mistral-7B base fine-tuned with distilled DPO that punched well above its weight on chat benchmarks when released, and remains a clean, permissi... |
| Full review → | Full review → | Full review → | Full review → |
Comparisons cover up to 4 tools. Scores are RECATOOLS editorial assessments; verify current pricing on each vendor's site.