Colosseum 355B Instruct vs Hunyuan Hy3 Preview
Colosseum 355B Instruct (2025) and Hunyuan Hy3 Preview (2026) are frontier reasoning models from iGenius and Tencent AI Lab. Colosseum 355B Instruct ships a 16k-token context window, while Hunyuan Hy3 Preview ships a 262k-token context window. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads. It focuses on practical selection signals rather than broad model-family marketing.
Hunyuan Hy3 Preview fits 16x more tokens; pick it for long-context work and Colosseum 355B Instruct for tighter calls.
Decision scorecard
Local evidence first| Signal | Colosseum 355B Instruct | Hunyuan Hy3 Preview |
|---|---|---|
| Best for | general production evaluation | reasoning-heavy apps, tool-calling agents, and provider-routed production |
| Decision fit | General | Coding, RAG, and Agents |
| Context window | 16k | 262k |
| Cheapest output | - | $0.26/1M tokens |
| Provider routes | 1 tracked | 2 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- Use Colosseum 355B Instruct when your own prompt tests beat the comparison signals; the local data does not show a decisive standalone advantage yet.
- Hunyuan Hy3 Preview has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Hunyuan Hy3 Preview has broader tracked provider coverage for fallback and route flexibility.
- Hunyuan Hy3 Preview uniquely exposes Reasoning and JSON / Tool use in local model data.
- Local decision data tags Hunyuan Hy3 Preview 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.
Colosseum 355B Instruct
Unavailable
No complete token price in local provider data
Hunyuan Hy3 Preview
$118
Cheapest tracked route/tier: OpenRouter
Cost delta unavailable until both models have sourced input and output token prices.
Switch friction
- No overlapping tracked provider route is sourced for Colosseum 355B Instruct and Hunyuan Hy3 Preview; plan for SDK, billing, or endpoint changes.
- Hunyuan Hy3 Preview adds Reasoning and JSON / JSON / Tool use in local capability data.
- No overlapping tracked provider route is sourced for Hunyuan Hy3 Preview and Colosseum 355B Instruct; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Reasoning and JSON / JSON / Tool use before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-01-01 | 2026-04-22 |
| Context window | 16k | 262k |
| Parameters | 355B | 295B |
| Architecture | Decoder Only | Dense + MoE Hybrid |
| License | Llama 3 Community | Tencent Hunyuan Community License |
| Openness | Open weights | Open weights |
| Weights | Unknown | Available |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: conditional |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | Colosseum 355B Instruct | Hunyuan Hy3 Preview |
|---|---|---|
| Input price | - | $0.07/1M tokens |
| Output price | - | $0.26/1M tokens |
| Providers |
Capabilities
| Capability | Colosseum 355B Instruct | Hunyuan Hy3 Preview |
|---|---|---|
| Vision | No | No |
| Multimodal | No | No |
| Reasoning | No | Yes |
| JSON / Tool use | No | Yes |
| Structured outputs | No | No |
| 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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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.