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AI model comparison

Claude Haiku 4.5 vs Step 3.5 Flash 2603

Compare pricing, context limits, supported inputs and deployment options to choose a model for your workflow.

Claude Haiku 4.5 from Anthropic lists 200K context, 64K maximum output, $1.00 input per 1M tokens, $5.00 output per 1M tokens. Step 3.5 Flash 2603 from StepFun lists 256K context, 256K maximum output, $0.10 input per 1M tokens, $0.30 output per 1M tokens. Compare the inputs, outputs and deployment options below to see which fits your workflow.

Side-by-sideCapabilities and practical differences

Anthropic

Claude Haiku 4.5

Claude Haiku 4.5 from Anthropic: Fast Claude model for responsive assistance, classification, and lightweight agents.

Context
200K
Max output
64K
Input / 1M tokens
$1.00
Output / 1M tokens
$5.00

Accepts

  • Text input
  • Image input
  • PDF input

Produces

  • Text output
Full model profilegithub.com ↗
VS

StepFun

Step 3.5 Flash 2603

Step 3.5 Flash 2603 from StepFun: StepFun flash model for efficient multimodal reasoning, coding, and tool use.

Context
256K
Max output
256K
Input / 1M tokens
$0.10
Output / 1M tokens
$0.30

Accepts

  • Text input

Produces

  • Text output
Full model profilegithub.com ↗

At a glance

Key differences

Compare the available figures below, then try both models on the work you need to do.

Step 3.5 Flash 2603

  • Context capacity: 256K
  • Maximum output: 256K
  • Input price: $0.10
  • Output price: $0.30

Context capacity

Higher listed limit

Claude Haiku 4.5:200K

Step 3.5 Flash 2603:256K

Step 3.5 Flash 2603

Maximum output

Higher listed limit

Claude Haiku 4.5:64K

Step 3.5 Flash 2603:256K

Step 3.5 Flash 2603

Input price

Lower listed token rate

Claude Haiku 4.5:$1.00

Step 3.5 Flash 2603:$0.10

Step 3.5 Flash 2603

Output price

Lower listed token rate

Claude Haiku 4.5:$5.00

Step 3.5 Flash 2603:$0.30

Step 3.5 Flash 2603

Specifications

Pricing, limits and capabilities

Specifications for Claude Haiku 4.5 and Step 3.5 Flash 2603. Higher limits and lower prices describe these figures only.
SpecificationClaude Haiku 4.5Step 3.5 Flash 2603
ProviderAnthropicStepFun
Listed pricing routeAnthropicStepFun
Model familyclaude-haiku—
Accepted inputstext, image, pdftext
Produced outputstexttext
Context window200K256KHigher
Max output64K256KHigher
Input price / 1M$1.00$0.10Lower
Output price / 1M$5.00$0.30Lower
Reasoning modeDocumentedDocumented
Tool callingDocumentedDocumented
Image inputDocumentedNot documented
Audio inputNot documentedNot documented
Structured outputNot documentedNot documented
LicenseProprietaryOpen weights

Workload guidance

Which model should you choose?

Consider Step 3.5 Flash 2603 if you need larger context or larger maximum output or a lower listed input rate or a lower listed output rate. Step 3.5 Flash 2603 offers downloadable weights; Claude Haiku 4.5 is listed as a proprietary model. Compare licence terms and operating costs before choosing a deployment. Test both on the same representative examples and judge the output against your acceptance criteria. Include tool failures, retries and the time to a completed task.

Documentation and model profiles

Explore each model’s features, API requirements and licence terms in the sources below.

Questions people ask

It brings together documented inputs and outputs, token limits, deployment terms and available pricing. When both models have source-linked, verified results on a shared benchmark, those results are shown with their individual sources. The comparison is a starting point for evaluating your own workload.

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