Llama 3 8B Instruct vs o3 Mini
Llama 3 8B Instruct (2024) and o3 Mini (2025) are frontier reasoning models from AI at Meta and OpenAI. Llama 3 8B Instruct ships a 8K-token context window, while o3 Mini ships a not-yet-sourced context window. On MMLU PRO, o3 Mini leads by 38.6 pts. On pricing, Llama 3 8B Instruct costs $0.03/1M input tokens versus $1.1/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Llama 3 8B Instruct is ~3567% cheaper at $0.03/1M; pay for o3 Mini only for coding workflow support.
Specs
| Released | 2024-04-18 | 2025-03-31 |
| Context window | 8K | — |
| Parameters | 8B | — |
| Architecture | decoder only | decoder only |
| License | Open Source | Unknown |
| Knowledge cutoff | - | 2025-04 |
Pricing and availability
| Llama 3 8B Instruct | o3 Mini | |
|---|---|---|
| Input price | $0.03/1M tokens | $1.1/1M tokens |
| Output price | $0.04/1M tokens | $4.4/1M tokens |
| Providers |
Capabilities
| Llama 3 8B Instruct | o3 Mini | |
|---|---|---|
| Vision | ||
| Multimodal | ||
| Reasoning | ||
| Function calling | ||
| Tool use | ||
| Structured outputs | ||
| Code execution |
Benchmarks
| Benchmark | Llama 3 8B Instruct | o3 Mini |
|---|---|---|
| MMLU PRO | 40.5 | 79.1 |
| Google-Proof Q&A | 44.8 | 79.7 |
Deep dive
On shared benchmark coverage, MMLU PRO has Llama 3 8B Instruct at 40.5 and o3 Mini at 79.1, with o3 Mini ahead by 38.6 points; Google-Proof Q&A has Llama 3 8B Instruct at 44.8 and o3 Mini at 79.7, with o3 Mini ahead by 34.9 points. The largest visible gap is 38.6 points on MMLU PRO, which matters most when that benchmark mirrors your workload. Treat isolated benchmark wins as directional, because provider routing, prompt style, and tool access can move real application results.
The capability footprint differs most on reasoning mode: o3 Mini, function calling: o3 Mini, tool use: o3 Mini, and code execution: o3 Mini. Both models share structured outputs, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, Llama 3 8B Instruct lists $0.03/1M input and $0.04/1M output tokens, while o3 Mini lists $1.1/1M input and $4.4/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Llama 3 8B Instruct lower by about $2.06 per million blended tokens. Availability is 17 providers versus 3, so concentration risk also matters.
Choose Llama 3 8B Instruct when provider fit, lower input-token cost, and broader provider choice are central to the workload. Choose o3 Mini when coding workflow support are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which is cheaper, Llama 3 8B Instruct or o3 Mini?
Llama 3 8B Instruct is cheaper on tracked token pricing. Llama 3 8B Instruct costs $0.03/1M input and $0.04/1M output tokens. o3 Mini costs $1.1/1M input and $4.4/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Llama 3 8B Instruct or o3 Mini open source?
Llama 3 8B Instruct is listed under Open Source. o3 Mini is listed under Unknown. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for reasoning mode, Llama 3 8B Instruct or o3 Mini?
o3 Mini has the clearer documented reasoning mode signal in this comparison. If reasoning mode is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for function calling, Llama 3 8B Instruct or o3 Mini?
o3 Mini has the clearer documented function calling signal in this comparison. If function calling is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for tool use, Llama 3 8B Instruct or o3 Mini?
o3 Mini has the clearer documented tool use signal in this comparison. If tool use is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run Llama 3 8B Instruct and o3 Mini?
Llama 3 8B Instruct is available on AWS Bedrock, DeepInfra, OctoAI API, Fireworks AI, and Alibaba Cloud PAI-EAS. o3 Mini is available on OpenRouter, OpenAI Batch API, and Azure OpenAI. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-04-24. Data sourced from public model cards and provider documentation.