o3 vs Qwen3.5-35B-A3B
o3 (2025) and Qwen3.5-35B-A3B (2026) are frontier-tier reasoning models from OpenAI and Alibaba. o3 ships a 200k-token context window, while Qwen3.5-35B-A3B ships a 262k-token context window. On SWE-bench Verified, o3 leads by 2.5 pts. On pricing, Qwen3.5-35B-A3B costs $0.14/1M 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.
Qwen3.5-35B-A3B is ~1339% cheaper at $0.14/1M; pay for o3 only for coding workflow support.
Decision scorecard
Local evidence first| Signal | o3 | Qwen3.5-35B-A3B |
|---|---|---|
| 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 | 200k | 262k |
| Cheapest output | $8/1M tokens | $1/1M tokens |
| Provider routes | 3 tracked | 2 tracked |
| Shared benchmarks | SWE-bench Verified leader | 5 shared |
Decision tradeoffs
- o3 holds a shared-benchmark lead on SWE-bench Verified, ahead by 2.5 points.
- o3 has broader tracked provider coverage for fallback and route flexibility.
- o3 uniquely exposes Vision, Multimodal, and Code execution in local model data.
- Local decision data tags o3 for Coding, RAG, and Agents.
- Qwen3.5-35B-A3B holds a shared-benchmark lead on Humanity's Last Exam, ahead by 2.1 points.
- Qwen3.5-35B-A3B has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Qwen3.5-35B-A3B has the lower cheapest tracked output price at $1/1M tokens.
- Local decision data tags Qwen3.5-35B-A3B 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.
o3
$3,600
Cheapest tracked route/tier: OpenAI API
Qwen3.5-35B-A3B
$361
Cheapest tracked route/tier: OpenRouter
Estimated monthly gap: $3,239. 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.
- Qwen3.5-35B-A3B is $7/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Vision, Multimodal, and Code execution before moving production traffic.
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- o3 is $7/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- o3 adds Vision, Multimodal, and Code execution in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-04-16 | 2026-02-24 |
| Context window | 200k | 262k |
| Parameters | — | 35B |
| Architecture | Decoder Only | Mixture of Experts |
| License | Proprietary | Apache 2.0OSI-approved |
| Openness | Proprietary | Open source |
| Weights | Not released | Available |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: permitted |
| Knowledge cutoff | 2024-06 | - |
Pricing and availability
| Pricing attribute | o3 | Qwen3.5-35B-A3B |
|---|---|---|
| Input price | $2/1M tokens | $0.14/1M tokens |
| Output price | $8/1M tokens | $1/1M tokens |
| Providers |
Capabilities
| Capability | o3 | Qwen3.5-35B-A3B |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | Yes | Yes |
| JSON / Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | o3 | Qwen3.5-35B-A3B |
|---|---|---|
| SWE-bench Verified | 71.7 | 69.2 |
| Google-Proof Q&A | 87.7 | 84.5 |
| LiveCodeBench | 85.5 | 74.6 |
| Humanity's Last Exam | 20.3 | 22.4 |
| MMMU Pro | 76.4 | 75.1 |
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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.