Llama 3.1 405B Instruct vs o3 Deep Research
Llama 3.1 405B Instruct (2024) and o3 Deep Research (2025) are frontier reasoning models from AI at Meta and OpenAI. Llama 3.1 405B Instruct ships a 128k-token context window, while o3 Deep Research ships a 200k-token context window. On pricing, Llama 3.1 405B Instruct costs $2.40/1M input tokens versus $10/1M 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 3.1 405B Instruct is ~317% cheaper at $2.40/1M; pay for o3 Deep Research only for reasoning depth.
Decision scorecard
Local evidence first| Signal | Llama 3.1 405B Instruct | o3 Deep Research |
|---|---|---|
| Best for | provider-routed production | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | RAG, Long context, and Classification | RAG, Agents, and Long context |
| Context window | 128k | 200k |
| Cheapest output | $2.40/1M tokens | $40/1M tokens |
| Provider routes | 11 tracked | 2 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- Llama 3.1 405B Instruct has the lower cheapest tracked output price at $2.40/1M tokens.
- Llama 3.1 405B Instruct has broader tracked provider coverage for fallback and route flexibility.
- Local decision data tags Llama 3.1 405B Instruct for RAG, Long context, and Classification.
- o3 Deep Research has the larger context window for long prompts, retrieval packs, or transcript analysis.
- o3 Deep Research uniquely exposes Vision, Multimodal, and Reasoning in local model data.
- Local decision data tags o3 Deep Research for RAG, Agents, and Long context.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Llama 3.1 405B Instruct
$2,520
Cheapest tracked route/tier: AWS Bedrock
o3 Deep Research
$18,000
Cheapest tracked route/tier: Vercel AI Gateway
Estimated monthly gap: $15,480. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- No overlapping tracked provider route is sourced for Llama 3.1 405B Instruct and o3 Deep Research; plan for SDK, billing, or endpoint changes.
- o3 Deep Research is $37.60/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- o3 Deep Research adds Vision, Multimodal, and Reasoning in local capability data.
- No overlapping tracked provider route is sourced for o3 Deep Research and Llama 3.1 405B Instruct; plan for SDK, billing, or endpoint changes.
- Llama 3.1 405B Instruct is $37.60/1M 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 | 2024-07-23 | 2025-10-10 |
| Context window | 128k | 200k |
| Parameters | 405B | — |
| 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 | 2023-12 | 2024-06 |
Pricing and availability
| Pricing attribute | Llama 3.1 405B Instruct | o3 Deep Research |
|---|---|---|
| Input price | $2.40/1M tokens | $10/1M tokens |
| Output price | $2.40/1M tokens | $40/1M tokens |
| Providers |
Capabilities
| Capability | Llama 3.1 405B Instruct | o3 Deep Research |
|---|---|---|
| Vision | No | Yes |
| Multimodal | No | Yes |
| Reasoning | No | Yes |
| JSON / Tool use | No | Yes |
| Structured outputs | Yes | Yes |
| Code execution | No | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark scores are currently available for this pair.
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Last reviewed: 2026-07-11. Data sourced from public model cards and provider documentation.