Best Open-Source AI Models in 2026: Self-Host or Use API
The best open-weight models to self-host or run through cheap API hosts: Llama 4 Maverick, DeepSeek V4, Qwen3 Coder, GLM 4.7 Flash, Mistral Large 3 and Kimi K2.6.
Default recommendation
Llama 4 Maverick is the default open-weight model: hosted at $0.20 in / $0.70 out per 1M tokens or free per token on your own GPUs. Use DeepSeek V4 Pro for reasoning and coding, Qwen3 Coder for code-only workloads, and GLM 4.7 Flash when you need the cheapest hosted route that still handles tool calls.
Llama 4 Maverick
Meta's flagship open-weight mixture-of-experts model with a 1M context. Broad quality, widely hosted, and cheap through OpenRouter at $0.20 in / $0.70 out per 1M tokens. Llama 4 Scout ($0.10 in / $0.30 out per 1M tokens) is the lighter sibling with a 1.3M context.
Top Picks
Llama 4 Maverick
Best General Open-Weight ModelMeta
Meta's flagship open-weight mixture-of-experts model with a 1M context. Broad quality, widely hosted, and cheap through OpenRouter at $0.20 in / $0.70 out per 1M tokens. Llama 4 Scout ($0.10 in / $0.30 out per 1M tokens) is the lighter sibling with a 1.3M context.
$0 self-hosted / ≈ $0.34/month at 1M input + 200K output tokens hosted
Calculate your cost with Llama 4 Maverick →DeepSeek V4 Pro
Best Open-Weight for Reasoning & CodingDeepSeek
$0.66 in / $1.98 out per 1M tokens hosted, 1M context. Frontier-competitive reasoning and coding with open weights; DeepSeek V4 Flash ($0.05 in / $0.16 out per 1M tokens) is the same family at a twelfth of the price for high-volume steps.
$0 self-hosted / ≈ $1.06/month at 1M input + 200K output tokens hosted
Try DeepSeek V4 Pro →Qwen3 Coder 480B
Best Open-Weight Coding ModelAlibaba
$0.30 in / $1 out per 1M tokens hosted, 256K context. Purpose-built for code generation and agentic coding; the Qwen 3.x family also covers strong multilingual general models.
$0 self-hosted / ≈ $0.50/month at 1M input + 200K output tokens hosted
Calculate your cost with Qwen3 Coder 480B →GLM 4.7 Flash
Cheapest Hosted Open Model with Tool CallsZ Ai
$0.06 in / $0.40 out per 1M tokens hosted, 200K context. The cheapest open-weight route that still returns reliable function calls, so it doubles as the budget tier for agent loops. GLM 4.7 ($0.40 in / $1.75 out per 1M tokens) is the larger sibling.
$0 self-hosted / ≈ $0.14/month at 1M input + 200K output tokens hosted
Calculate your cost with GLM 4.7 Flash →Mistral Large 3
Best EU Open-Weight ModelMistral AI
$0.50 in / $1.50 out per 1M tokens hosted, 256K context. EU-based, open-weight and GDPR-friendly, with Devstral 2 ($0.40 in / $2 out per 1M tokens) as the coding-focused variant.
$0 self-hosted / ≈ $0.80/month at 1M input + 200K output tokens hosted
Try Mistral Large 3 →Kimi K2.6
Best for Long Agent RunsMoonshotai
$0.95 in / $4 out per 1M tokens hosted, 256K context. Strong on multi-step agentic tasks and tool use; pricier per token than the others here but still well under closed frontier models.
$0 self-hosted / ≈ $1.75/month at 1M input + 200K output tokens hosted
Calculate your cost with Kimi K2.6 →Frequently Asked Questions
What hardware do I need to self-host these models?
Maverick, DeepSeek V4 and Qwen3 Coder 480B are large mixture-of-experts models that need a multi-GPU server; GLM 4.7 Flash and Llama 4 Scout are the lighter options. For intermittent use, renting inference from OpenRouter or a GPU cloud is almost always cheaper than owning hardware.
Is self-hosting actually cheaper?
Only at sustained high volume. At 1M input and 200K output tokens a month, Llama 4 Maverick costs about $0.34 hosted, far below any GPU rental. Self-hosting wins when utilisation is high or data cannot leave your network.
Which open-weight model is best for coding agents?
Qwen3 Coder 480B ($0.30 in / $1 out per 1M tokens) and DeepSeek V4 Pro ($0.66 in / $1.98 out per 1M tokens) for the planning and editing steps; GLM 4.7 Flash or DeepSeek V4 Flash for the cheap repetitive tool calls in between.
Can I use open-source models in commercial products?
Mostly yes, with licence-specific limits. Llama's community licence restricts very large companies; several Mistral, Qwen and DeepSeek releases use permissive licences. Read the model card for the exact release before shipping.
Not sure which is right for you?
Use the calculator to estimate your real cost, or take the decision quiz.
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