Llama 3 8B Instruct vs o3
Llama 3 8B Instruct (2024) and o3 (2025) are frontier reasoning models from AI at Meta and OpenAI. Llama 3 8B Instruct ships a 8k-token context window, while o3 ships a 200k-token context window. On Google-Proof Q&A, o3 leads by 42.9 pts. On pricing, Llama 3 8B Instruct costs $0.02/1M input tokens versus $2/1M for the alternative. 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 ~9900% cheaper at $0.02/1M; pay for o3 only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Llama 3 8B Instruct | o3 |
|---|---|---|
| Best for | provider-routed production | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | Coding, Classification, and JSON / Tool use | Coding, RAG, and Agents |
| Context window | 8k | 200k |
| Cheapest output | $0.05/1M tokens | $8/1M tokens |
| Provider routes | 17 tracked | 3 tracked |
| Shared benchmarks | 2 shared | Google-Proof Q&A 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 holds a shared-benchmark lead on Google-Proof Q&A, ahead by 42.9 points.
- o3 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- o3 uniquely exposes Vision, Multimodal, and Reasoning in local model data.
- Local decision data tags o3 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
$3,600
Cheapest tracked route/tier: OpenAI API
Estimated monthly gap: $3,572. 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 is $7.95/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- o3 adds Vision, Multimodal, and Reasoning in local capability data.
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Llama 3 8B Instruct is $7.95/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Vision, Multimodal, and Reasoning before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2024-04-18 | 2025-04-16 |
| 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 | 2024-06 |
Pricing and availability
| Pricing attribute | Llama 3 8B Instruct | o3 |
|---|---|---|
| Input price | $0.02/1M tokens | $2/1M tokens |
| Output price | $0.05/1M tokens | $8/1M tokens |
| Providers |
Capabilities
| Capability | Llama 3 8B Instruct | o3 |
|---|---|---|
| Vision | No | Yes |
| Multimodal | No | Yes |
| 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 |
|---|---|---|
| Google-Proof Q&A | 44.8 | 87.7 |
| HumanEval | 68.2 | 96.7 |
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Last reviewed: 2026-07-11. Data sourced from public model cards and provider documentation.