Grok-3 vs o3 Deep Research
Grok-3 (2025) and o3 Deep Research (2025) are frontier-tier reasoning models from xAI and OpenAI. Grok-3 ships a 131K-token context window, while o3 Deep Research ships a 200K-token context window. On pricing, Grok-3 costs $0.80/1M input tokens versus $10/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit. It focuses on practical selection signals rather than broad model-family marketing.
Grok-3 is ~1150% cheaper at $0.80/1M; pay for o3 Deep Research only for long-context analysis.
Decision scorecard
Local evidence first| Signal | Grok-3 | o3 Deep Research |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | Coding, RAG, and Agents | RAG, Agents, and Long context |
| Context window | 131K | 200K |
| Cheapest output | $2.40/1M tokens | $40/1M tokens |
| Provider routes | 4 tracked | 1 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Grok-3 has the lower cheapest tracked output price at $2.40/1M tokens.
- Grok-3 has broader tracked provider coverage for fallback and procurement flexibility.
- Local decision data tags Grok-3 for Coding, RAG, and Agents.
- o3 Deep Research has the larger context window for long prompts, retrieval packs, or transcript analysis.
- 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.
Grok-3
$1,240
Cheapest tracked route/tier: Chutes AI
o3 Deep Research
$18,000
Cheapest tracked route/tier: Vercel AI Gateway
Estimated monthly gap: $16,760. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- No overlapping tracked provider route is sourced for Grok-3 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.
- No overlapping tracked provider route is sourced for o3 Deep Research and Grok-3; plan for SDK, billing, or endpoint changes.
- Grok-3 is $37.60/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-02-17 | 2025-10-10 |
| Context window | 131K | 200K |
| Parameters | — | — |
| Architecture | - | decoder only |
| License | Proprietary | Proprietary |
| Knowledge cutoff | 2025-04 | 2024-06 |
Pricing and availability
| Pricing attribute | Grok-3 | o3 Deep Research |
|---|---|---|
| Input price | $0.80/1M tokens | $10/1M tokens |
| Output price | $2.40/1M tokens | $40/1M tokens |
| Providers |
Capabilities
| Capability | Grok-3 | o3 Deep Research |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | Yes |
| Function calling | Yes | Yes |
| Tool use | Yes | 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 rows are currently sourced for this pair.
Deep dive
The capability footprint is close: both models cover vision, multimodal input, reasoning mode, function calling, and tool use. That makes context budget, benchmark fit, and provider maturity more important than a simple checklist. If your application depends on one integration detail, verify it against the provider route you plan to use, not just the base model listing.
For cost, Grok-3 lists $0.80/1M input and $2.40/1M output tokens on the cheapest tracked provider, while o3 Deep Research lists $10/1M input and $40/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Grok-3 lower by about $17.72 per million blended tokens. Availability is 4 providers versus 1, so concentration risk also matters.
Choose Grok-3 when vision-heavy evaluation, lower input-token cost, and broader provider choice are central to the workload. Choose o3 Deep Research when long-context analysis and larger context windows are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions. It also helps separate model capability from provider packaging, which can change cost and latency.
FAQ
Which has a larger context window, Grok-3 or o3 Deep Research?
o3 Deep Research supports 200K tokens, while Grok-3 supports 131K tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Grok-3 or o3 Deep Research?
Grok-3 is cheaper on tracked token pricing. Grok-3 costs $0.80/1M input and $2.40/1M output tokens. o3 Deep Research costs $10/1M input and $40/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Grok-3 or o3 Deep Research open source?
Grok-3 is listed under Proprietary. o3 Deep Research is listed under Proprietary. 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 vision, Grok-3 or o3 Deep Research?
Both Grok-3 and o3 Deep Research expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Which is better for multimodal input, Grok-3 or o3 Deep Research?
Both Grok-3 and o3 Deep Research expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Where can I run Grok-3 and o3 Deep Research?
Grok-3 is available on OpenRouter, xAI Console, Chutes AI, and Microsoft Foundry. o3 Deep Research is available on Vercel AI Gateway. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-05-22. Data sourced from public model cards and provider documentation.