Claude Sonnet 4.5 vs Grok 3 Mini
Claude Sonnet 4.5 (2025) and Grok 3 Mini (2025) are frontier reasoning models from Anthropic and xAI. Claude Sonnet 4.5 ships a 200k-token context window, while Grok 3 Mini ships a 131k-token context window. On pricing, Claude Sonnet 4.5 ranges from $3 to $6/1M input tokens by tier; Grok 3 Mini costs $0.25/1M input tokens. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Claude Sonnet 4.5 is safer overall; choose Grok 3 Mini when vision-heavy evaluation matters.
Decision scorecard
Local evidence first| Signal | Claude Sonnet 4.5 | Grok 3 Mini |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | multimodal apps and provider-routed production |
| Decision fit | Coding, RAG, and Agents | RAG, Long context, and Vision |
| Context window | 200k | 131k |
| Cheapest output | $15/1M tokens | $1.27/1M tokens |
| Provider routes | 8 tracked | 2 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- Claude Sonnet 4.5 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Claude Sonnet 4.5 has broader tracked provider coverage for fallback and route flexibility.
- Claude Sonnet 4.5 uniquely exposes Reasoning and JSON / Tool use in local model data.
- Local decision data tags Claude Sonnet 4.5 for Coding, RAG, and Agents.
- Grok 3 Mini has the lower cheapest tracked output price at $1.27/1M tokens.
- Local decision data tags Grok 3 Mini for RAG, Long context, and Vision.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Claude Sonnet 4.5
$6,150
Cheapest tracked route/tier: Microsoft Foundry
Grok 3 Mini
$518
Cheapest tracked route/tier: Microsoft Foundry
Estimated monthly gap: $5,633. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter and Microsoft Foundry; start route-level A/B tests there.
- Grok 3 Mini is $13.73/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Reasoning and JSON / Tool use before moving production traffic.
- Provider overlap exists on Microsoft Foundry and OpenRouter; start route-level A/B tests there.
- Claude Sonnet 4.5 is $13.73/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Claude Sonnet 4.5 adds Reasoning and JSON / Tool use in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-09-29 | 2025-02-17 |
| Context window | 200k | 131k |
| Parameters | — | — |
| Architecture | Decoder Only | - |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Weights | Not released | Not released |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: conditional |
| Knowledge cutoff | 2025-12 | 2024-11 |
Pricing and availability
| Pricing attribute | Claude Sonnet 4.5 | Grok 3 Mini |
|---|---|---|
| Input price |
| $0.25/1M tokens |
| Output price |
| $1.27/1M tokens |
| Providers |
Capabilities
| Capability | Claude Sonnet 4.5 | Grok 3 Mini |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | No |
| JSON / Tool use | Yes | No |
| 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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Popular comparisons for Claude Sonnet 4.5
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Last reviewed: 2026-07-26. Data sourced from public model cards and provider documentation.