Claude Sonnet 4.6 vs Flint
Pricing, benchmarks, and use case comparison
Quick take
- •Claude Sonnet 4.6 is meaningfully stronger at long context (90 vs 0 on our capability index).
- •Flint is open-weights (free to self-host); Claude Sonnet 4.6 is paid API only.
Specs comparison
| Claude Sonnet 4.6 | Flint | |
|---|---|---|
| Provider | Anthropic | Springboards |
| Type | Closed source | Closed source |
| Context window | ✓1M | Not announced |
| Input / 1M tokens | $3.00 | ✓Not announced |
| Output / 1M tokens | $15.00 | Not announced |
| Release date | 2026-02 | 2026-04 |
Benchmarks
| Benchmark | Claude Sonnet 4.6 | Flint |
|---|---|---|
| SWE-bench Verified | 79.6% | - |
| Terminal-Bench 2.0 | 59.1% | - |
| OSWorld-Verified | 72.5% | - |
| GPQA | 79.7% | - |
| Novelty Bench | - | 7/10 |
| Intra-Model Similarity | - | 0.721 |
| NoveltyBench | - | 7.47 |
Scores sourced from official provider release posts and independent benchmark aggregators.
Which should you choose?
Choose Claude Sonnet 4.6 if...
- →You have an existing integration pinned to Sonnet 4.6 and want stability
- →You need a proven mid-tier model with 1M context at $3/$15
- →You want predictable behavior without the new-tokenizer/thinking changes in Sonnet 5
- →You are cost-sensitive and don't need Sonnet 5's incremental gains
Choose Flint if...
- →When exploring diverse creative directions
- →For early-stage ideation and concept generation
- →When variety and novelty are more important than accuracy