# Stepfun Step 5 Preview (LLM): On AA Pareto frontier > Source: > Published: 2026-09-19 05:42:31+00:00 # Step 5 Preview Intelligence, Performance & Price Analysis ### Model summary #### Speed Step 5 Preview is amongst the leading models in intelligence and well priced when comparing to other models of similar price. The model supports text and image input, outputs text, and has a 1M tokens context window. Step 5 Preview scores 44 on the Artificial Analysis Intelligence Index, placing it well above average among comparable models (median: 25). When evaluating the Intelligence Index, it generated 160M tokens, which is very verbose in comparison to the median of 90M. Pricing for Step 5 Preview is $1.00 per 1M input tokens (competitively priced, median: $1.88) and $2.70 per 1M output tokens (competitively priced, median: $10.00). In total, it cost $918.34 to evaluate Step 5 Preview on the Intelligence Index. | Reasoning | Yes This page shows the reasoning version of this model. A non-reasoning variant may also exist. | |---|---| | Input modality | Supports: text and image | | Output modality | Supports: text | | Context window | 1M ~1500 A4 pages of size 12 Arial font | Metrics are compared against models of the same class: - Non-reasoning models → compared only with other non-reasoning models - Reasoning models → compared across both reasoning and non-reasoning - Open weights models → compared only with other open weights models of the same size class: - Tiny: ≤4B parameters - Small: 4B–40B parameters - Medium: 40B–150B parameters - Large: >150B parameters - Proprietary models → compared across proprietary and open weights models of the same price range, using a blended 3:1 input/output price ratio: - <$0.15 per 1M tokens - $0.15–$1 per 1M tokens - >$1 per 1M tokens Highlights ### Speed ## IntelligenceUpdated ### [Artificial Analysis Intelligence Index](https://artificialanalysis.ai/evaluations/artificial-analysis-intelligence-index) ### Artificial Analysis Intelligence Index by Open Weights / Proprietary Measures the performance of models on specific capabilities and industries ### [Artificial Analysis Finance & Accounting Index](https://artificialanalysis.ai/models/capabilities/finance-and-accounting) ### Intelligence Evaluations Agentic knowledge work, (Elo-500)/2000 Agentic real-world work tasks, (Elo-500)/2000 [AutomationBench-AA](https://artificialanalysis.ai/evaluations/automationbench-aa)Updated Agentic SaaS workflows Agentic coding & terminal use Coding Reasoning & knowledge [GDP.pdf](https://artificialanalysis.ai/evaluations/gdp-pdf)New Professional document reasoning, All-pass Physics reasoning Knowledge 1 - hallucination rate Long context reasoning Legal agentic work, criterion pass rate Agentic business operations Quantitative analysis on spreadsheets & documents Agentic tool use Kubernetes incident root-cause analysis Visual reasoning [MLCR-AA](https://artificialanalysis.ai/evaluations/mlcr-aa)New Medical long context reasoning ### AA-Briefcase ### AA-Briefcase Elo ### AA-Omniscience ### AA-Omniscience Index ## Intelligence Index Comparisons ### Intelligence Index vs. Cost per Intelligence Index Task ## Token Use ### Output Tokens per Intelligence Index Task ## Cost ### Cost per Intelligence Index Task ### Cost to Run Artificial Analysis Intelligence Index ### Pricing: Cache Hit, Input, and Output ## Context Window ### Context Window ## Frequently Asked Questions Common questions about Step 5 Preview Step 5 Preview was released on September 18, 2026. Step 5 Preview was created by StepFun. Step 5 Preview scores 44 on the Artificial Analysis Intelligence Index, placing it well above average among other reasoning models in a similar price tier (median: 25). Step 5 Preview costs $1.00 per 1M input tokens (very competitive, median: $1.88) and $2.70 per 1M output tokens (very competitive, median: $10.00), based on StepFun's API. Step 5 Preview costs $1.00 per 1M input tokens and $2.70 per 1M output tokens (based on StepFun's API). For a blended rate (7:2:1 cache hit/input/output ratio), this is $0.51 per 1M tokens. Pricing may vary by provider. [Compare provider pricing](https://artificialanalysis.ai/models/step-5/providers) When evaluated on the Intelligence Index, Step 5 Preview generated 160M output tokens, which is at the higher end compared to other reasoning models in a similar price tier (median: 90M). Yes, Step 5 Preview is a reasoning model. It uses extended thinking or chain-of-thought reasoning to work through complex problems before providing an answer. Step 5 Preview supports text and image input. Step 5 Preview supports text output. Yes, Step 5 Preview supports image input and can analyze, describe, and answer questions about images. Yes, Step 5 Preview is multimodal. It can process text and image input and generate text output. Step 5 Preview has a context window of 1.0M tokens. This determines how much text and conversation history the model can process in a single request. No, Step 5 Preview is proprietary. The model weights are not publicly available. Step 5 Preview has 600 billion parameters. Step 5 Preview achieves a score of 44 on the Artificial Analysis Intelligence Index. This composite benchmark evaluates models across reasoning, knowledge, mathematics, and coding. Yes, Step 5 Preview is available via API through 1 provider. [Compare API providers](https://artificialanalysis.ai/models/step-5/providers) Step 5 Preview is available through 1 API provider. [Compare providers](https://artificialanalysis.ai/models/step-5/providers)