AIモデルインテリジェンス

Step 3.5 Flash 2603

stepfun/step-3-5-flash-2603

提供： StepFun · リリース 2026-04-02 · 知識カットオフ: 2025-01

$0.100
入力 / 100万トークン
$0.300
出力 / 100万トークン
256K
コンテキスト長
256K
最大出力

Prices in USD per 1M tokens. Unknown means the provider does not publish per-token pricing.

機能一覧

✓ ツール呼び出し✓ 推論? 構造化出力✗ 添付✓ オープンウェイト✓ 温度制御
モダリティ: 入力 text · 出力 text

Model fit scores

0–100 · higher is better

These scores reward declared capabilities, context size, price and provider availability — they are not benchmark results. Use them as a directional signal alongside your own evaluation.

Coding59
  • Tool calling40/40
  • Structured output0/20
  • Reasoning10/10
  • Context window (100K → 1M)8/20
  • Provider availability1/10
Agents66
  • Tool calling35/35
  • Structured output0/25
  • Reasoning15/15
  • Output token limit15/15
  • Provider availability1/10
JSON / structured output49
  • Structured output / JSON mode0/50
  • Tool calling20/20
  • Temperature control10/10
  • Price-friendly for high-volume19/20
Cost efficiency77
  • Headline price (log-scaled)72/95
  • Has prompt-cache pricing5/5
Long context60
  • Context window (100K → 2M)50/90
  • Has published price for full window10/10
Production-readiness65
  • Number of independent providers5/40
  • Has published per-token price20/20
  • Context window ≥ 8K15/15
  • No data inconsistencies across providers10/10
  • Official model (not derivative)15/15

Cost Efficiency Index

Open full calculator →

Estimated cost using the recommended provider's headline rate. Each scenario fixes average input/output tokens — the assumptions are shown in the third column.

ScenarioCostAssumption
RAG answer
per 1,000 RAG answers
$0.65
< $0.01 per request
5K input tokens (query + 4 retrieved chunks of ~1K each) and a 500-token answer. Typical SaaS knowledge-base bot.
Support ticket triage
per 10,000 tickets
$1.30
< $0.01 per request
1K input tokens (ticket body + system prompt) and a 100-token JSON classification reply. High-volume customer support.
Data extraction
per 1,000 documents
$0.35
< $0.01 per request
2K input tokens (a single document page) and a 500-token JSON extraction. ETL / invoice / form pipelines.
Code review
per 1,000 PRs
$1.10
< $0.01 per request
8K input tokens (diff + surrounding files) and a 1K-token review comment. PR-bot workloads.
Agent step
per 1,000 steps
$1.38
< $0.01 per request
12K input tokens (long-running tool history) and a 600-token tool-call decision. Cost per agent step.

料金詳細

推奨料金 (提供元): stepfun · step-3.5-flash-2603

$0.100
入力
$0.300
出力
$0.020
キャッシュ読み取り

1 か所で利用可能

プロバイダープロバイダーモデルID入力 / 1M出力 / 1Mコンテキストリリース日
StepFun
stepfun
step-3.5-flash-2603$0.100$0.300256K2026-04-02

Frequently asked questions

How much does Step 3.5 Flash 2603 cost?

Step 3.5 Flash 2603 costs $0.100 per 1M input tokens and $0.300 per 1M output tokens, sourced from stepfun. Cache reads, audio tokens and >200K-context tiers (where applicable) are listed in the Pricing detail block above.

What is the context window of Step 3.5 Flash 2603?

Step 3.5 Flash 2603 has a context window of 256K tokens, with a max output of 256K tokens per reply. This is the total combined size of prompt + completion.

Does Step 3.5 Flash 2603 support tool calling?

Yes. Step 3.5 Flash 2603 supports tool calling (function calling). This makes it suitable for production agent and automation workloads where the model has to invoke external functions reliably.

Does Step 3.5 Flash 2603 support structured output / JSON mode?

Support for structured output / JSON-schema-constrained decoding is not reported for Step 3.5 Flash 2603 in our data source. Verify with StepFun's official documentation before relying on it in production.

Can Step 3.5 Flash 2603 accept image input?

No. Step 3.5 Flash 2603 only accepts text as input. If you need image input, see our /capabilities/vision list for current vision-capable models.

Is Step 3.5 Flash 2603 open-weight?

Yes. Step 3.5 Flash 2603's weights are publicly available, so you can self-host or fine-tune. Note that open weights ≠ open source — the training data and code are typically not released.

What are the best alternatives to Step 3.5 Flash 2603?

If Step 3.5 Flash 2603 doesn't fit, consider Step 3.5 Flash, Step 1 (32K), Step 2 (16K). Each one targets the same use case — see the Related links below for direct head-to-head pages.

Where does this data come from?

All numbers come from the public models.dev API and are normalised into a single canonical model record. We re-pull daily and write any changes (price, context, capability) to the /changelog page.

Explore more

More StepFun models

Capability lists this model is in

See also

最終更新：

Data is sourced from models.dev and normalized for comparison. Prices and capabilities may change. Always verify critical production decisions with the provider's official documentation.