MiniMax M2-her vs Step 3.5 Flash
MiniMax M2-her (2026) and Step 3.5 Flash (2026) are frontier reasoning models from MiniMax and StepFun. MiniMax M2-her ships a 64k-token context window, while Step 3.5 Flash ships a 256k-token context window. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit. It focuses on practical selection signals rather than broad model-family marketing. The goal is to make the tradeoff clear before deeper testing.
Step 3.5 Flash fits 4x more tokens; pick it for long-context work and MiniMax M2-her for tighter calls.
Decision scorecard
Local evidence first| Signal | MiniMax M2-her | Step 3.5 Flash |
|---|---|---|
| Best for | general production evaluation | reasoning-heavy apps |
| Decision fit | General | Long context |
| Context window | 64k | 256k |
| Cheapest output | - | $0.30/1M tokens |
| Provider routes | 0 tracked | 1 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Use MiniMax M2-her when your own prompt tests beat the comparison signals; the local data does not show a decisive standalone advantage yet.
- Step 3.5 Flash has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Step 3.5 Flash has broader tracked provider coverage for fallback and procurement flexibility.
- Step 3.5 Flash uniquely exposes Reasoning in local model data.
- Local decision data tags Step 3.5 Flash for Long context.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
MiniMax M2-her
Unavailable
No complete token price in local provider data
Step 3.5 Flash
$155
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 MiniMax M2-her and Step 3.5 Flash; plan for SDK, billing, or endpoint changes.
- Step 3.5 Flash adds Reasoning in local capability data.
- No overlapping tracked provider route is sourced for Step 3.5 Flash and MiniMax M2-her; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Reasoning before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-03-01 | 2026-01-29 |
| Context window | 64k | 256k |
| Parameters | — | 196B (11B active) |
| Architecture | decoder only | mixture of experts |
| License | Proprietary | Open Source |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | MiniMax M2-her | Step 3.5 Flash |
|---|---|---|
| Input price | - | $0.10/1M tokens |
| Output price | - | $0.30/1M tokens |
| Providers | - |
Capabilities
| Capability | MiniMax M2-her | Step 3.5 Flash |
|---|---|---|
| Vision | No | No |
| Multimodal | No | No |
| Reasoning | No | Yes |
| Function calling | No | No |
| Tool use | No | No |
| Structured outputs | No | No |
| Code execution | No | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on reasoning mode: Step 3.5 Flash. Both models share the core language-model surface, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
Pricing coverage is uneven: MiniMax M2-her has no token price sourced yet and Step 3.5 Flash has $0.10/1M input tokens. Provider availability is 0 tracked routes versus 1. Treat unknown pricing as an integration gap, then verify the route you will actually call before estimating production spend.
Choose MiniMax M2-her when provider fit are central to the workload. Choose Step 3.5 Flash when reasoning depth, larger context windows, and broader provider choice are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions. It also helps separate model capability from provider packaging, which can change cost and latency. For teams standardizing a stack, that distinction is often the difference between a benchmark win and a reliable deployment.
FAQ
Which has a larger context window, MiniMax M2-her or Step 3.5 Flash?
Step 3.5 Flash supports 256k tokens, while MiniMax M2-her supports 64k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Is MiniMax M2-her or Step 3.5 Flash open source?
MiniMax M2-her is listed under Proprietary. Step 3.5 Flash is listed under Open Source. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for reasoning mode, MiniMax M2-her or Step 3.5 Flash?
Step 3.5 Flash has the clearer documented reasoning mode signal in this comparison. If reasoning mode is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run MiniMax M2-her and Step 3.5 Flash?
MiniMax M2-her is available on the tracked providers still being sourced. Step 3.5 Flash is available on OpenRouter. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
When should I pick MiniMax M2-her over Step 3.5 Flash?
Step 3.5 Flash fits 4x more tokens; pick it for long-context work and MiniMax M2-her for tighter calls. If your workload also depends on provider fit, start with MiniMax M2-her; if it depends on reasoning depth, run the same evaluation with Step 3.5 Flash.
Continue comparing
Last reviewed: 2026-05-29. Data sourced from public model cards and provider documentation.