Claude Sonnet 4.6 vs o3 Mini
Claude Sonnet 4.6 (2026) and o3 Mini (2025) are frontier-tier reasoning models from Anthropic and OpenAI. Claude Sonnet 4.6 ships a 1m-token context window, while o3 Mini ships a 200k-token context window. On MMLU PRO, Claude Sonnet 4.6 leads by 8.2 pts. On pricing, o3 Mini costs $1.10/1M input tokens versus $3/1M 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.
o3 Mini is ~173% cheaper at $1.10/1M; pay for Claude Sonnet 4.6 only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Claude Sonnet 4.6 | o3 Mini |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | reasoning-heavy apps, tool-calling agents, and provider-routed production |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1m | 200k |
| Cheapest output | $15/1M tokens | $4.40/1M tokens |
| Provider routes | 6 tracked | 4 tracked |
| Shared benchmarks | MMLU PRO leader | 4 shared |
Decision tradeoffs
- Claude Sonnet 4.6 holds a shared-benchmark lead on MMLU PRO, ahead by 8.2 points.
- Claude Sonnet 4.6 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Claude Sonnet 4.6 has broader tracked provider coverage for fallback and route flexibility.
- Claude Sonnet 4.6 uniquely exposes Vision, Multimodal, and Computer use in local model data.
- Local decision data tags Claude Sonnet 4.6 for Coding, RAG, and Agents.
- o3 Mini has the lower cheapest tracked output price at $4.40/1M tokens.
- 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.
Claude Sonnet 4.6
$6,150
Cheapest tracked route/tier: OpenRouter
o3 Mini
$1,980
Cheapest tracked route/tier: OpenRouter
Estimated monthly gap: $4,170. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter and Vercel AI Gateway; start route-level A/B tests there.
- o3 Mini is $10.60/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Vision, Multimodal, and Computer use before moving production traffic.
- Provider overlap exists on OpenRouter and Vercel AI Gateway; start route-level A/B tests there.
- Claude Sonnet 4.6 is $10.60/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Claude Sonnet 4.6 adds Vision, Multimodal, and Computer use in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-02-17 | 2025-01-31 |
| Context window | 1m | 200k |
| Parameters | — | — |
| Architecture | Decoder Only | 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 | 2025-08 | 2025-04 |
Pricing and availability
| Pricing attribute | Claude Sonnet 4.6 | o3 Mini |
|---|---|---|
| Input price | $3/1M tokens | $1.10/1M tokens |
| Output price | $15/1M tokens | $4.40/1M tokens |
| Providers |
Capabilities
| Capability | Claude Sonnet 4.6 | o3 Mini |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | Yes | Yes |
| JSON / Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | Yes |
| IDE integration | No | No |
| Computer use | Yes | No |
| Parallel agents | Yes | No |
Benchmarks
| Benchmark | Claude Sonnet 4.6 | o3 Mini |
|---|---|---|
| MMLU PRO | 87.3 | 79.1 |
| SWE-bench Verified | 79.6 | 49.3 |
| Google-Proof Q&A | 89.9 | 79.7 |
| Chatbot Arena | 1459.0 | 1335.0 |
Continue comparing
- Claude Sonnet 4.6 vs o3 Deep Research
- Claude Sonnet 4.6 vs Phi-4 Mini Flash Reasoning
- Claude Opus 4.6 vs o3 Mini
- Claude Sonnet 4.6 vs DeepSeek V4 Flash
- Claude Sonnet 4.6 vs DeepSeek V4 Pro
- Claude Sonnet 4.6 vs Kimi K2.6
- Claude Sonnet 4.6 vs Composer 2.5
- Claude Sonnet 4.6 vs GPT-5.5 Pro
- Claude Sonnet 4.6 vs Gemini 3.5 Flash
- Claude Sonnet 4.6 vs GLM-5.1
Popular comparisons for Claude Sonnet 4.6
Popular comparisons for o3 Mini
Last reviewed: 2026-07-26. Data sourced from public model cards and provider documentation.