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 200k-token context window. On MMLU PRO, o3 Mini leads by 38.6 pts. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Llama 3 8B Instruct is ~5400% cheaper at $0.02/1M; pay for o3 Mini only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Llama 3 8B Instruct | o3 Mini |
|---|---|---|
| Best for | provider-routed production | reasoning-heavy apps, tool-calling agents, and provider-routed production |
| Decision fit | Coding, Classification, and JSON / Tool use | Coding, RAG, and Agents |
| Context window | 8k | 200k |
| Cheapest output | $0.05/1M tokens | $4.40/1M tokens |
| Provider routes | 17 tracked | 4 tracked |
| Shared benchmarks | 2 shared | MMLU PRO leader |
Decision tradeoffs
- Llama 3 8B Instruct has the lower cheapest tracked output price at $0.05/1M tokens.
- Llama 3 8B Instruct has broader tracked provider coverage for fallback and route flexibility.
- Local decision data tags Llama 3 8B Instruct for Coding, Classification, and JSON / Tool use.
- o3 Mini holds a shared-benchmark lead on MMLU PRO, ahead by 38.6 points.
- o3 Mini has the larger context window for long prompts, retrieval packs, or transcript analysis.
- o3 Mini uniquely exposes Reasoning, JSON / Tool use, and Code execution in local model data.
- Local decision data tags o3 Mini for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Llama 3 8B Instruct
$28.50
Cheapest tracked route/tier: DeepInfra
o3 Mini
$1,980
Cheapest tracked route/tier: OpenRouter
Estimated monthly gap: $1,952. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- o3 Mini is $4.35/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- o3 Mini adds Reasoning, JSON / Tool use, and Code execution in local capability data.
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Llama 3 8B Instruct is $4.35/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Reasoning, JSON / Tool use, and Code execution before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2024-04-18 | 2025-01-31 |
| Context window | 8k | 200k |
| Parameters | 8B | — |
| Architecture | Decoder Only | Decoder Only |
| License | Llama 3 Community | Proprietary |
| Openness | Open weights | Proprietary |
| Weights | Available | Not released |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: conditional |
| Knowledge cutoff | 2023-03 | 2025-04 |
Pricing and availability
| Pricing attribute | Llama 3 8B Instruct | o3 Mini |
|---|---|---|
| Input price | $0.02/1M tokens | $1.10/1M tokens |
| Output price | $0.05/1M tokens | $4.40/1M tokens |
| Providers |
Capabilities
| Capability | Llama 3 8B Instruct | o3 Mini |
|---|---|---|
| Vision | No | No |
| Multimodal | No | No |
| Reasoning | No | Yes |
| JSON / Tool use | No | Yes |
| Structured outputs | Yes | Yes |
| Code execution | No | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | Llama 3 8B Instruct | o3 Mini |
|---|---|---|
| MMLU PRO | 40.5 | 79.1 |
| Google-Proof Q&A | 44.8 | 79.7 |
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Last reviewed: 2026-07-11. Data sourced from public model cards and provider documentation.