GPT-4o Mini (07-18) vs Step 3.7 Flash

Name: GPT-4o Mini (07-18)
Author: OpenAI

GPT-4o Mini (07-18) (2024) and Step 3.7 Flash (2026) are frontier reasoning models from OpenAI and StepFun. GPT-4o Mini (07-18) ships a 128k-token context window, while Step 3.7 Flash ships a 256k-token context window. On pricing, GPT-4o Mini (07-18) costs $0.15/1M input tokens versus $0.20/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.

Step 3.7 Flash is safer overall; choose GPT-4o Mini (07-18) when coding workflow support matters.

Decision scorecard

Local evidence first

Signal	GPT-4o Mini (07-18)	Step 3.7 Flash	How to read it
Best for	multimodal apps and provider-routed production	reasoning-heavy apps, multimodal apps, and tool-calling agents	Use-case synthesis from product type, capability flags, context, and provider data.
Decision fit	Coding, RAG, and Agents	Coding, RAG, and Agents	Primary workload tags from local decision data.
Context window	128k	256k	Higher is better when prompts, retrieval chunks, or transcripts are large.
Cheapest output	$0.60/1M tokens	$1.15/1M tokens	Cheapest tracked provider route; verify your exact region and tier.
Provider routes	3 tracked	3 tracked	Broader coverage can reduce vendor lock-in and fallback risk.
Shared benchmarks	0 rows	0 rows	No shared benchmark rows are sourced for this pair yet.

Decision tradeoffs

Choose GPT-4o Mini (07-18) when...

GPT-4o Mini (07-18) has the lower cheapest tracked output price at $0.60/1M tokens.
GPT-4o Mini (07-18) uniquely exposes Code execution in local model data.
Local decision data tags GPT-4o Mini (07-18) for Coding, RAG, and Agents.

Choose Step 3.7 Flash when...

Step 3.7 Flash has the larger context window for long prompts, retrieval packs, or transcript analysis.
Step 3.7 Flash uniquely exposes Multimodal, Reasoning, and Function calling 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.

Lower estimate GPT-4o Mini (07-18)

Requests / monthInput tokens / requestOutput tokens / request

GPT-4o Mini (07-18)

$270

Cheapest tracked route/tier: OpenAI API

Step 3.7 Flash

$448

Cheapest tracked route/tier: StepFun

Estimated monthly gap: $178. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

GPT-4o Mini (07-18) -> Step 3.7 Flash

Provider overlap exists on OpenRouter; start route-level A/B tests there.
Step 3.7 Flash is $0.55/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
Check replacement coverage for Code execution before moving production traffic.
Step 3.7 Flash adds Multimodal, Reasoning, and Function calling in local capability data.

Step 3.7 Flash -> GPT-4o Mini (07-18)

Provider overlap exists on OpenRouter; start route-level A/B tests there.
GPT-4o Mini (07-18) is $0.55/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
Check replacement coverage for Multimodal, Reasoning, and Function calling before moving production traffic.
GPT-4o Mini (07-18) adds Code execution in local capability data.

Specs

Specification	GPT-4o Mini (07-18) OpenAI	Step 3.7 Flash StepFun
Released	2024-07-18	2026-05-29
Context window	128k	256k
Parameters	—	198B (11B active)
Architecture	decoder only	mixture of experts
License	Proprietary	Apache 2.0
Knowledge cutoff	2023-10	-

Pricing and availability

Pricing attribute	GPT-4o Mini (07-18)	Step 3.7 Flash
Input price	$0.15/1M tokens	$0.20/1M tokens
Output price	$0.60/1M tokens	$1.15/1M tokens
Providers	OpenAI API OpenRouter Replicate API	StepFun OpenRouter NVIDIA NIM

Capabilities

Capability	GPT-4o Mini (07-18)	Step 3.7 Flash
Vision	Yes	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 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: GPT-4o Mini (07-18). Both models share vision and 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, GPT-4o Mini (07-18) lists $0.15/1M input and $0.60/1M 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 GPT-4o Mini (07-18) lower by about $0.20 per million blended tokens. Availability is 3 providers versus 3, so concentration risk also matters.

Choose GPT-4o Mini (07-18) when coding workflow support and lower input-token cost are central to the workload. Choose Step 3.7 Flash when reasoning depth and larger context windows 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, GPT-4o Mini (07-18) or Step 3.7 Flash?

Step 3.7 Flash supports 256k tokens, while GPT-4o Mini (07-18) supports 128k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.

Which is cheaper, GPT-4o Mini (07-18) or Step 3.7 Flash?

GPT-4o Mini (07-18) is cheaper on tracked token pricing. GPT-4o Mini (07-18) costs $0.15/1M input and $0.60/1M 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 GPT-4o Mini (07-18) or Step 3.7 Flash open source?

GPT-4o Mini (07-18) is listed under Proprietary. 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, GPT-4o Mini (07-18) or Step 3.7 Flash?

Both GPT-4o Mini (07-18) and Step 3.7 Flash expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.

Which is better for multimodal input, GPT-4o Mini (07-18) 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 GPT-4o Mini (07-18) and Step 3.7 Flash?

GPT-4o Mini (07-18) is available on OpenAI API, OpenRouter, and Replicate API. 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.