Colosseum 355B
colosseum-355b
Last refreshed 2026-04-18. Next refresh: weekly.
Colosseum 355B has model metadata, but missing tracked provider pricing keeps it from being a default production pick.
Decision context: Long context task fit, 0 tracked provider routes, and research from 2026-01-01.
Use it for
- Teams evaluating long context
- Workloads that can use a 131K context window
Do not use it for
- Cost-sensitive launches that need sourced token pricing
- Vision or document-understanding workloads
- Strict JSON or tool-calling flows
Cheapest output
-
No tracked output price
Provider routes
0
No provider route in seed
Quality / dollar
Unknown
No task benchmark coverage yet
Freshness
2026-01-01
Researched 137d ago
Top use-case fit
Long context
Included by capability and metadata signals in the decision map.
Provider price ladder
No tracked provider token pricing is available for this model yet.
Benchmark peer barsfor Long context
No task-mapped benchmark peers are available for this model yet.
Migration checks
No linked migration route is available for this model yet.
About
Pre-instruct base model for Colosseum series. Custom dense architecture trained from scratch on Italian and multilingual data. Serves as foundation for instruction-tuned variants.
Colosseum 355B has a 128K-token context window.
Capabilities
No model capability flags are currently sourced.