Decision support
Sonic 3.5 vs S2.1 Pro Free
Compare canonical objects directly. The useful dimensions change with the object type, so model and hardware comparisons stay separate.
Sonic 3.5
Cartesia
Benchmark results
No benchmark results have been matched to these models yet.
Model specifications
Release date
June 15, 2026
July 29, 2026
Context window
—
—
Native context
—
—
Max output tokens
—
0
Knowledge cutoff
—
—
Open weights
Closed
Unknown
Parameter count
—
—
API pricing · USD per 1M tokens
Input
—
$0.00
Output
—
$0.00
Cached input
—
—
Cache write
—
—
Capabilities and modalities
Input modalities
text
text
Output modalities
audio
speech
Tool calling
—
—
Reasoning option
—
—
Supported options
—
—
Capabilities
—
—
Architecture and availability
Architecture
—
—
Model families
—
—
Tokenizer
—
Other
Instruction format
—
—
License
proprietary
—
Providers
0
0
Provider endpoints
0
0
Ollama variants
0
0
Metadata source
curated
ai-research
A dash means the field is not reported. Provider-specific performance and pricing may differ.