Gemini 2.5 Pro Preview 06-05 vs Step 3.7 Flash
Gemini 2.5 Pro Preview 06-05 (2025) and Step 3.7 Flash (2026) are frontier reasoning models from Google DeepMind and StepFun. Gemini 2.5 Pro Preview 06-05 ships a 1m-token context window, while Step 3.7 Flash ships a 256k-token context window. On pricing, Step 3.7 Flash costs $0.20/1M input tokens versus $1.25/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Step 3.7 Flash is ~525% cheaper at $0.20/1M; pay for Gemini 2.5 Pro Preview 06-05 only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Gemini 2.5 Pro Preview 06-05 | Step 3.7 Flash |
|---|---|---|
| Best for | long-context analysis | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1m | 256k |
| Cheapest output | $10/1M tokens | $1.15/1M tokens |
| Provider routes | 1 tracked | 3 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Gemini 2.5 Pro Preview 06-05 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Gemini 2.5 Pro Preview 06-05 uniquely exposes Code execution in local model data.
- Local decision data tags Gemini 2.5 Pro Preview 06-05 for Coding, RAG, and Agents.
- Step 3.7 Flash has the lower cheapest tracked output price at $1.15/1M tokens.
- Step 3.7 Flash has broader tracked provider coverage for fallback and procurement flexibility.
- Step 3.7 Flash uniquely exposes Vision, Multimodal, and Reasoning in local model data.
- Local decision data tags Step 3.7 Flash 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.
Gemini 2.5 Pro Preview 06-05
$3,500
Cheapest tracked route/tier: OpenRouter
Step 3.7 Flash
$448
Cheapest tracked route/tier: StepFun
Estimated monthly gap: $3,053. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Step 3.7 Flash is $8.85/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Code execution before moving production traffic.
- Step 3.7 Flash adds Vision, Multimodal, and Reasoning in local capability data.
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Gemini 2.5 Pro Preview 06-05 is $8.85/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Vision, Multimodal, and Reasoning before moving production traffic.
- Gemini 2.5 Pro Preview 06-05 adds Code execution in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-03-25 | 2026-05-29 |
| Context window | 1m | 256k |
| Parameters | — | 198B (11B active) |
| Architecture | decoder only | mixture of experts |
| License | Unknown | Apache 2.0 |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | Gemini 2.5 Pro Preview 06-05 | Step 3.7 Flash |
|---|---|---|
| Input price | $1.25/1M tokens | $0.20/1M tokens |
| Output price | $10/1M tokens | $1.15/1M tokens |
| Providers |
Capabilities
| Capability | Gemini 2.5 Pro Preview 06-05 | Step 3.7 Flash |
|---|---|---|
| Vision | No | Yes |
| Multimodal | No | Yes |
| Reasoning | No | Yes |
| Function calling | No | Yes |
| Tool use | No | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | 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 vision: Step 3.7 Flash, multimodal input: Step 3.7 Flash, reasoning mode: Step 3.7 Flash, function calling: Step 3.7 Flash, tool use: Step 3.7 Flash, and code execution: Gemini 2.5 Pro Preview 06-05. Both models share structured outputs, 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.
For cost, Gemini 2.5 Pro Preview 06-05 lists $1.25/1M input and $10/1M output tokens on the cheapest tracked provider, while Step 3.7 Flash lists $0.20/1M input and $1.15/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Step 3.7 Flash lower by about $3.39 per million blended tokens. Availability is 1 providers versus 3, so concentration risk also matters.
Choose Gemini 2.5 Pro Preview 06-05 when coding workflow support and larger context windows are central to the workload. Choose Step 3.7 Flash when reasoning depth, lower input-token cost, 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.
FAQ
Which has a larger context window, Gemini 2.5 Pro Preview 06-05 or Step 3.7 Flash?
Gemini 2.5 Pro Preview 06-05 supports 1m tokens, while Step 3.7 Flash supports 256k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Gemini 2.5 Pro Preview 06-05 or Step 3.7 Flash?
Step 3.7 Flash is cheaper on tracked token pricing. Gemini 2.5 Pro Preview 06-05 costs $1.25/1M input and $10/1M output tokens. Step 3.7 Flash costs $0.20/1M input and $1.15/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Gemini 2.5 Pro Preview 06-05 or Step 3.7 Flash open source?
Gemini 2.5 Pro Preview 06-05 is listed under Unknown. Step 3.7 Flash is listed under Apache 2.0. 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 vision, Gemini 2.5 Pro Preview 06-05 or Step 3.7 Flash?
Step 3.7 Flash has the clearer documented vision signal in this comparison. If vision is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for multimodal input, Gemini 2.5 Pro Preview 06-05 or Step 3.7 Flash?
Step 3.7 Flash has the clearer documented multimodal input signal in this comparison. If multimodal input is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run Gemini 2.5 Pro Preview 06-05 and Step 3.7 Flash?
Gemini 2.5 Pro Preview 06-05 is available on OpenRouter. Step 3.7 Flash is available on StepFun, OpenRouter, and NVIDIA NIM. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-05-29. Data sourced from public model cards and provider documentation.