LLM Reference

o3 vs Qwen3.5-397B-A17B

o3 (2025) and Qwen3.5-397B-A17B (2026) are frontier-tier reasoning models from OpenAI and Alibaba. o3 ships a 200k-token context window, while Qwen3.5-397B-A17B ships a 262k-token context window. On SWE-bench Verified, Qwen3.5-397B-A17B leads by 4.5 pts. On pricing, Qwen3.5-397B-A17B costs $0.39/1M 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.

Qwen3.5-397B-A17B is ~413% cheaper at $0.39/1M; pay for o3 only for coding workflow support.

Decision scorecard

Local evidence first
Signalo3Qwen3.5-397B-A17B
Best forreasoning-heavy apps, multimodal apps, and tool-calling agentsreasoning-heavy apps, multimodal apps, and tool-calling agents
Decision fitCoding, RAG, and AgentsCoding, RAG, and Agents
Context window200k262k
Cheapest output$8/1M tokens$2.34/1M tokens
Provider routes3 tracked4 tracked
Shared benchmarks5 sharedSWE-bench Verified leader

Decision tradeoffs

Choose o3 when...
  • o3 holds a shared-benchmark lead on LiveCodeBench, ahead by 1.9 points.
  • o3 uniquely exposes Code execution in local model data.
  • Local decision data tags o3 for Coding, RAG, and Agents.
Choose Qwen3.5-397B-A17B when...
  • Qwen3.5-397B-A17B holds a shared-benchmark lead on SWE-bench Verified, ahead by 4.5 points.
  • Qwen3.5-397B-A17B has the larger context window for long prompts, retrieval packs, or transcript analysis.
  • Qwen3.5-397B-A17B has the lower cheapest tracked output price at $2.34/1M tokens.
  • Qwen3.5-397B-A17B has broader tracked provider coverage for fallback and route flexibility.
  • Local decision data tags Qwen3.5-397B-A17B 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.

Lower estimate Qwen3.5-397B-A17B

o3

$3,600

Cheapest tracked route/tier: OpenAI API

Qwen3.5-397B-A17B

$897

Cheapest tracked route/tier: OpenRouter

Estimated monthly gap: $2,703. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

o3 -> Qwen3.5-397B-A17B
  • Provider overlap exists on OpenRouter; start route-level A/B tests there.
  • Qwen3.5-397B-A17B is $5.66/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
  • Check replacement coverage for Code execution before moving production traffic.
Qwen3.5-397B-A17B -> o3
  • Provider overlap exists on OpenRouter; start route-level A/B tests there.
  • o3 is $5.66/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
  • o3 adds Code execution in local capability data.

Specs

Specification
Released2025-04-162026-02-16
Context window200k262k
Parameters—397B
ArchitectureDecoder OnlyMixture of Experts
LicenseProprietaryApache 2.0OSI-approved
OpennessProprietaryOpen source
WeightsNot releasedAvailable
CodeUnknownUnknown
Commercial useCommercial use: conditionalCommercial use: permitted
Knowledge cutoff2024-06-

Pricing and availability

Pricing attributeo3Qwen3.5-397B-A17B
Input price$2/1M tokens$0.39/1M tokens
Output price$8/1M tokens$2.34/1M tokens
Providers
OpenAI APIOpenRouterVercel AI Gateway
OpenRouterTogether AIAlibaba Cloud PAI-EASNovita AI

Capabilities

Capabilityo3Qwen3.5-397B-A17B
VisionYesYes
MultimodalYesYes
ReasoningYesYes
JSON / Tool useYesYes
Structured outputsYesYes
Code executionYesNo
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

Benchmarko3Qwen3.5-397B-A17B
SWE-bench Verified71.776.2
Google-Proof Q&A87.789.3
LiveCodeBench85.583.6
Massive Multi-discipline Multimodal Understanding82.985.0
Humanity's Last Exam20.328.7

Continue comparing

Model pages
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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.