# step-3.5-flash-2603 [Canonical model page](https://headlessthrones.com/models/stepfun-step-3-5-flash-2603) · [Model library](https://headlessthrones.com/models) Public catalog reference from Headless Thrones. Exact catalog ID: `stepfun-step-3-5-flash-2603`. Catalog source-check date: 2026-10-23. This brief contains the public catalog answers and any catalog guide, not private drafts, historical editorial revisions or independently measured rankings. The canonical HTML page may also display separately published editorial. Current catalog answers ## What to know about step-3.5-flash-2603 AI-compiled from linked model documentation. This is a catalog reference, not an independent performance review. Catalog checked October 23, 2026. [Exact model](https://headlessthrones.com/models/stepfun-step-3-5-flash-2603#model-answer-identity) · [Access](https://headlessthrones.com/models/stepfun-step-3-5-flash-2603#model-answer-access) · [Token limits](https://headlessthrones.com/models/stepfun-step-3-5-flash-2603#model-answer-context) · [Inputs & outputs](https://headlessthrones.com/models/stepfun-step-3-5-flash-2603#model-answer-modalities) · [Model details](https://headlessthrones.com/models/stepfun-step-3-5-flash-2603#model-answer-research) ### Which step-3.5-flash-2603 does this page describe? step-3.5-flash-2603 is a model record from **StepFun** in the Step family. [Source](https://platform.stepfun.com/docs/zh/guides/models/list) The recorded model identifier or checkpoint is `step-3.5-flash-2603`. Use that exact identifier when checking documentation or a provider listing. [Source](https://platform.stepfun.com/docs/zh/guides/models/list) ### How can you access step-3.5-flash-2603? The catalog documents **API** access for step-3.5-flash-2603. [Source](https://platform.stepfun.com/docs/zh/guides/models/list) As of the catalog check, this version was listed as available. [Source](https://platform.stepfun.com/docs/zh/guides/models/list) For API use, confirm the exact model identifier, your account and region, and the endpoint's current limits in the linked documentation. An API listing does not establish access through a consumer subscription. ### What are step-3.5-flash-2603's context and output limits? The documented **context window is 256,000 tokens**. [Source](https://platform.stepfun.com/docs/zh/guides/models/list) A separate maximum-output value is not established in this record. The context or input figure should not be used as an output allowance. Context, input and output limits describe different constraints. Do not add the figures together to infer a larger window. Check the endpoint's accounting for conversation history, system instructions, tools, media and generated tokens; a documented maximum is not a guarantee of answer quality or a measured usable capacity. ### What can step-3.5-flash-2603 receive and generate? Documented inputs: **text**. [Source](https://platform.stepfun.com/docs/zh/guides/models/list) Documented outputs: **text**. [Source](https://platform.stepfun.com/docs/zh/guides/models/list) Input support and output generation are separate capabilities. Reading an image does not establish image generation; a text output listing does not establish speech output. File sizes, formats and media limits depend on the documented implementation. ### What distinguishes step-3.5-flash-2603? These details come from the linked publisher material for this model. Reported capabilities and training descriptions are publisher statements, not independent test results. **Variant changes**: StepFun describes this exact 2603 variant as an Agent-oriented optimization of Step 3.5 Flash, retaining tool calling and reasoning while adding a lower-reasoning mode to reduce consumption. [Source](https://platform.stepfun.com/docs/zh/guides/models/list) **Catalog qualifications:** Official context K/M display values normalized as decimal tokens. [Source](https://platform.stepfun.com/docs/zh/guides/models/list) **Evidence still missing here:** complete input/output pricing and knowledge and training-data cutoffs. Missing documentation is not evidence that a feature is unavailable. Headless Thrones has not independently benchmarked this model for this reference. Evaluate it on representative work before choosing it; these facts do not rank its accuracy, reliability, speed or suitability against another model. Keep the exact version in view ## Other Step models from StepFun. These are separate records in the same publisher family. A shared family name does not establish equal capabilities or interchangeable licenses. ### [step-1o-turbo-vision](https://headlessthrones.com/models/stepfun-step-1o-turbo-vision) API · 32,000 context tokens ### [Step-3.5-Flash](https://headlessthrones.com/models/stepfun-step-3-5-flash) API · Open weights · 256,000 context tokens ### [Step-3.5-Flash-Base](https://headlessthrones.com/models/stepfun-step-3-5-flash-base) Open weights ### [Step-3.5-Flash-Base-Midtrain](https://headlessthrones.com/models/stepfun-step-3-5-flash-base-midtrain) Open weights ### [Step-3.7-Flash](https://headlessthrones.com/models/stepfun-step-3-7-flash) API · Open weights · 256,000 context tokens ### [Step-Audio-2-mini](https://headlessthrones.com/models/stepfun-step-audio-2-mini) Open weights