Every tracked LLM ranked by what a single 600-word-in / 150-word-out message costs, with sources and cross-checks.
Bottom line: cheapest is Meta: Llama 3.1 8B Instruct at about $0.00006 per message; the median model costs $0.00114 per message; the most expensive, Anthropic: Claude Fable 5, costs $0.02 per message. That is a 321× spread for the same workload.
Scenario: ONE chat message: 600 words in (prompt + history) / 150 words out.
| Vendor | Model | In $/1M | Out $/1M | Cost per message | Source / check |
|---|---|---|---|---|---|
| Meta (Llama) | Meta: Llama 3.1 8B Instruct | $0.05 | $0.08 | $0.00006 | source 2026-10-16 ✔ matches |
| Meta (Llama) | Meta: Llama 3.2 1B Instruct | $0.027 | $0.201 | $0.00006 | source 2026-10-16 ✔ matches |
| Mistral | Mistral: Ministral 3 3B 2512 | $0.1 | $0.1 | $0.00010 | source 2026-10-16 ✔ matches |
| Meta (Llama) | Meta: Llama 3.2 3B Instruct | $0.05 | $0.33 | $0.00011 | source 2026-10-16 ✔ matches |
| DeepSeek | DeepSeek: DeepSeek V4 Flash 0423 | $0.091 | $0.182 | $0.00011 | source 2026-10-16 ℹ vs market median ($0.14/$0.28) |
| DeepSeek | DeepSeek: DeepSeek V4 Flash 0731 | $0.0111 | $0.64 | $0.00014 | source 2026-10-16 ℹ vs market median ($0.14/$0.4785) |
| Mistral | Mistral: Ministral 3 8B 2512 | $0.15 | $0.15 | $0.00015 | source 2026-10-16 ✔ matches |
| DeepSeek | DeepSeek: DeepSeek V4.1 Flash | $0.018 | $0.684 | $0.00015 | source 2026-10-16 ⚠ differs from lab price ($0.15/$0.6) |
| Meta (Llama) | Meta: Llama Guard 4 12B | $0.18 | $0.18 | $0.00018 | source 2026-10-16 ✔ matches |
| Anthropic | Anthropic: Claude Haiku 5.5 | $0.1 | $0.5 | $0.00018 | source 2026-10-16 ✔ matches |
| OpenAI | OpenAI: GPT-6 Luna Pro | $0.1 | $0.5 | $0.00018 | source 2026-10-16 ✔ matches |
| OpenAI | OpenAI: GPT-6 Luna | $0.1 | $0.5 | $0.00018 | source 2026-10-16 ✔ matches |
| Mistral | Mistral: Ministral 3 14B 2512 | $0.2 | $0.2 | $0.00020 | source 2026-10-16 ✔ matches |
| Mistral | Mistral: Mistral Small 4 | $0.15 | $0.6 | $0.00024 | source 2026-10-16 ✔ matches |
| Meta (Llama) | Meta: Llama 4 Scout | $0.18 | $0.59 | $0.00026 | source 2026-10-16 ℹ vs market median ($0.1/$0.3139) |
| Meta (Llama) | Meta: Llama 4 Maverick | $0.1875 | $0.6525 | $0.00028 | source 2026-10-16 ℹ vs market median ($0.2546/$0.85) |
| DeepSeek | DeepSeek: DeepSeek V3.2 Exp | $0.27 | $0.41 | $0.00030 | source 2026-10-16 ⚠ differs from lab price ($0.28/$0.42) |
| DeepSeek | DeepSeek: DeepSeek V4 Flash Vision Exp | $0.2156 | $0.6468 | $0.00030 | source 2026-10-16 ℹ vs market median ($0.3321/$0.9963) |
| DeepSeek | DeepSeek: DeepSeek V3.2 | $0.259 | $0.8 | $0.00037 | source 2026-10-16 ⚠ differs from lab price ($0.28/$0.42) |
| Meta (Llama) | Meta: Llama 3.1 70B Instruct | $0.4 | $0.4 | $0.00040 | source 2026-10-16 ℹ vs market median ($0.4/$0.56) |
| Google: Gemini 3.1 Flash Lite | $0.25 | $1.5 | $0.00050 | source 2026-10-16 ✔ matches | |
| Meta (Llama) | Meta: Llama 3.3 70B Instruct | $0.59 | $0.79 | $0.00063 | source 2026-10-16 ℹ vs market median ($0.5683/$0.72) |
| Mistral | Mistral: Mistral Large 3 2512 | $0.5 | $1.5 | $0.00070 | source 2026-10-16 ✔ matches |
| Mistral | Mistral: Devstral 2 2512 | $0.4 | $2.0 | $0.00072 | source 2026-10-16 ✔ matches |
| Google: Gemini 3.5 Flash Lite | $0.3 | $2.5 | $0.00074 | source 2026-10-16 ✔ matches | |
| DeepSeek | DeepSeek: DeepSeek V4 Pro 0813 | $0.66 | $1.98 | $0.00092 | source 2026-10-16 ✔ matches |
| Mistral | Mistral: Mistral Large 4 | $0.68 | $2.09 | $0.00096 | source 2026-10-16 ✔ matches |
| DeepSeek | DeepSeek: DeepSeek V4 Pro 0423 | $0.9553 | $1.9105 | $0.00114 | source 2026-10-16 ⚠ differs from lab price ($0.66/$1.98) |
| xAI | SpaceXAI: Grok Build 0.1 | $1.0 | $2.0 | $0.00120 | source 2026-10-16 ✔ matches |
| Google: Gemini 3.7 Flash | $0.75 | $3.75 | $0.00135 | source 2026-10-16 ✔ matches | |
| Google: Gemini 3.6 Flash | $0.75 | $3.75 | $0.00135 | source 2026-10-16 ✔ matches | |
| Google: Gemini 3.8 Flash | $0.825 | $4.125 | $0.00148 | source 2026-10-16 ⚠ differs from lab price ($0.75/$3.75) | |
| xAI | SpaceXAI: Grok 4.3 | $1.25 | $2.5 | $0.00150 | source 2026-10-16 ✔ matches |
| xAI | SpaceXAI: Grok 4.20 Multi-Agent | $1.25 | $2.5 | $0.00150 | source 2026-10-16 ✔ matches |
| xAI | SpaceXAI: Grok 4.20 | $1.25 | $2.5 | $0.00150 | source 2026-10-16 ✔ matches |
| Google: Nano Banana 2.1 | $1.5 | $7.5 | $0.00269 | source 2026-10-16 no 2nd source | |
| Mistral | Mistral: Mistral Medium 3.5 | $1.5 | $7.5 | $0.00269 | source 2026-10-16 ✔ matches |
| xAI | SpaceXAI: Grok 4.7 | $2.0 | $6.0 | $0.00279 | source 2026-10-16 ✔ matches |
| xAI | SpaceXAI: Grok 4.6 | $2.0 | $6.0 | $0.00279 | source 2026-10-16 ✔ matches |
| xAI | SpaceXAI: Grok 4.5 | $2.0 | $6.0 | $0.00279 | source 2026-10-16 ✔ matches |
| Google: Gemini 3.5 Flash | $1.5 | $9.0 | $0.00299 | source 2026-10-16 ✔ matches | |
| Google: Gemini 4 Argon | $2.0 | $10.0 | $0.00359 | source 2026-10-16 no 2nd source | |
| OpenAI | OpenAI: GPT-6.1 Sol Pro | $2.0 | $10.0 | $0.00359 | source 2026-10-16 ✔ matches |
| OpenAI | OpenAI: GPT-6.1 Sol | $2.0 | $10.0 | $0.00359 | source 2026-10-16 ✔ matches |
| Anthropic | Anthropic: Claude Sonnet 5.5 | $2.0 | $10.0 | $0.00359 | source 2026-10-16 ✔ matches |
| OpenAI | OpenAI: GPT-6 Sol Pro | $2.0 | $10.0 | $0.00359 | source 2026-10-16 ✔ matches |
| OpenAI | OpenAI: GPT-6 Sol | $2.0 | $10.0 | $0.00359 | source 2026-10-16 ✔ matches |
| Anthropic | Anthropic: Claude Sonnet 5 | $2.0 | $10.0 | $0.00359 | source 2026-10-16 ✔ matches |
| Anthropic | Anthropic: Claude Opus 5.5 | $4.0 | $20.0 | $0.00718 | source 2026-10-16 ✔ matches |
| Anthropic | Anthropic: Claude Opus 5 | $5.0 | $25.0 | $0.00898 | source 2026-10-16 ✔ matches |
| Anthropic | Anthropic: Claude Opus 4.8 | $5.0 | $25.0 | $0.00898 | source 2026-10-16 ✔ matches |
| OpenAI | OpenAI: GPT-6 Astra | $10.0 | $50.0 | $0.02 | source 2026-10-16 ✔ matches |
| OpenAI | OpenAI: GPT-6 Astra Pro | $10.0 | $50.0 | $0.02 | source 2026-10-16 ✔ matches |
| Anthropic | Anthropic: Claude Fable 5.1 | $10.0 | $50.0 | $0.02 | source 2026-10-16 ✔ matches |
| Anthropic | Anthropic: Claude Fable 5 | $10.0 | $50.0 | $0.02 | source 2026-10-16 ✔ matches |
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