--- title: "StepFun: Step 5 Preview — price, capability and what beats it · Undominated.ai" canonical: https://undominated.ai/models/stepfun__step-5-preview/ description: "StepFun: Step 5 Preview: $1.00/M in, $2.70/M out. Independent capability scores, and alternatives compared under recorded workload and capability requirements." --- # StepFun: Step 5 Preview — price, capability and what beats it · Undominated.ai > StepFun: Step 5 Preview: $1.00/M in, $2.70/M out. Independent capability scores, and alternatives compared under recorded workload and capability requirements. [Check base rates for this workload](/check/stepfun__step-5-preview/) [Cheaper alternatives](/alternatives/stepfun__step-5-preview/) [Family](/families/) [Compare models](https://undominated.ai/compare/?models=stepfun%2Fstep-5-preview) Comparison context Choose up to three standard models in Compare. Requirements and prompt length apply in Compare. This page keeps its stated price basis and workload controls. MODEL PROOF # Step 5 Preview StepFun · 08 Oct 2026 Balanced Summarise Chat Code gen Agentic BETTER VALUE OPTION ## A stored alternative has an equal-or-higher measured score and an equal-or-lower price. **$1.43** / 1M tokens Balanced · 3 tokens in per 1 out Serving precision differs between offers. [MiMo-V2.6-Pro](/models/xiaomi__mimo-v2.6-pro/) · Δ score 50.3 points · 62% lower measured price · $0.540 / 1M tokens (Price under confirmation since Oct 21, 2026) [GLM 5.3](/models/z-ai__glm-5.3/) is a further stored option with these losses: no image, video input Evidence as of 21 Oct 2026 [openrouter/models](https://openrouter.ai/api/v1/models) [LMArena · cc-by-4.0](https://huggingface.co/datasets/lmarena-ai/leaderboard-dataset) Independent LMArena score 1,440 ± 7.78 · 6,432 votes Context window 1.05M Maximum output 64K Input modalities text, image, video Output modalities text Published input price $1.00 / 1M tokens Published output price $2.70 / 1M tokens Pricing kind fixed Inspect [complete billing conditions](#billing-details) and endpoint terms below. Price from StepFun: the cheapest offer that is serving, at standard delivery, with at least 90% of the reference context and at the maker’s precision or better, at its standard rate. Every price dimension · USD per million tokens | Input | $1.00 /M | | --- | --- | | Output | $2.70 /M | | Cached input | $0.100 /M | | Cache write | Unknown /M | | Cache write 1h | Unknown /M | | Reasoning | Unknown /M | ### Who sells it The same weights, different shops. Cheapest is not like-for-like when serving precision differs. Headline cheapest is a lower precision. Like-for-like at the best declared precision is $1.00/M from DeepInfra. 5 provider offers · rates, limits and conditions Rates are USD per million tokens. Endpoint terms can differ even when the quoted price and precision match. A listed parameter is a provider declaration, not a task-success test. | Seller | Input | Output | Precision | Uptime (1d) | | --- | --- | --- | --- | --- | | Seller DeepInfra deepinfra/fp8 Endpoint terms Cached input /M $0.100 Context limit 1,048,576 tokens Output limit 65,536 tokens Tools Listed by endpoint Reasoning Listed by endpoint Promotional discount None reported Uptime · last 30 minutes Unknown | Input $1.00 | Output $2.70 | Precision fp8 | Uptime (1d) 97.47% | | Seller StepFun stepfun/fp8 Endpoint terms Cached input /M $0.100 Context limit 1,000,000 tokens Output limit 64,000 tokens Tools Listed by endpoint Reasoning Listed by endpoint Promotional discount None reported Uptime · last 30 minutes Unknown | Input $1.00 | Output $2.70 | Precision fp8 | Uptime (1d) 97.62% | | Seller InferenceNet inference-net/us Endpoint terms Cached input /M $0.050 Context limit 1,048,576 tokens Output limit 131,072 tokens Tools Listed by endpoint Reasoning Listed by endpoint Promotional discount None reported Uptime · last 30 minutes 100.00% | Input $1.00 | Output $2.70 | Precision fp4 | Uptime (1d) 100.00% | | Seller InferenceNet inference-net/fp4 Endpoint terms Cached input /M $0.050 Context limit 1,048,576 tokens Output limit 131,072 tokens Tools Listed by endpoint Reasoning Listed by endpoint Promotional discount None reported Uptime · last 30 minutes Unknown | Input $1.00 | Output $2.70 | Precision fp4 | Uptime (1d) 100.00% | | Seller Featherless featherless/fp4 Endpoint terms Cached input /M $0.100 Context limit 262,144 tokens Output limit 32,768 tokens Tools Listed by endpoint Reasoning Listed by endpoint Promotional discount None reported Uptime · last 30 minutes Unknown | Input $1.00 | Output $2.70 | Precision fp4 | Uptime (1d) 95.24% | ### Independent scores | LMArena Elo | 1440 default | | --- | --- | | LMArena row | Step 5 Preview | LMArena Elo under CC BY 4.0. Absence of another board is not a score of zero. ### Capability | Context window | 1M | | --- | --- | | Max output | 64K | | Input modes | text, image, video | | Tool use | yes | | Reasoning | always on | | Open weights | Unknown | ### Provenance | Price source | [openrouter.ai](https://openrouter.ai/api/v1/models) | | --- | --- | | Fetched | 2026-10-21 | | Quality data | verified | Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional... ## Questions this page answers What does Step 5 Preview cost? $1.00/M in, $2.70/M out in this catalogue, as of the fetch date on this page. That is the API row, not a subscription. Does Step 5 Preview have an independent quality score? Step 5 Preview has an LMArena score in this catalogue. What beats Step 5 Preview? MiMo-V2.6-Pro has an equal-or-higher measured score and an equal-or-lower price. Does this page use Artificial Analysis scores for Step 5 Preview? No. Artificial Analysis figures are not published here. Quality on this page is LMArena Elo where a score exists; otherwise the row is unrated. Is the cheapest Step 5 Preview endpoint the same product? Headline cheapest is a lower precision. Like-for-like at the best declared precision is $1.00/M from DeepInfra. MODEL MONUMENT ## Save or share this proof Download proof card · 1200 × 630 Preview and more sharing options StepFun: Step 5 Preview. Balanced workload. Better value option available. Evidence as of 21 Oct 2026. Copy model link Download square card · 1080 × 1080 Copy landscape image Share landscape card ## Related - Higher score or lower price, neither worse [MiMo-V2.6-Pro](/models/xiaomi__mimo-v2.6-pro/) - Higher score or lower price, with a named trade [GLM 5.3](/models/z-ai__glm-5.3/) - Nearby on the capability axis [Qwen3.8 27B](/models/qwen__qwen3.8-27b/) - Same vendor [Step 3.5 Flash](/models/stepfun__step-3.5-flash/) - StepFun models [StepFun](/providers/stepfun/) - Where this model appears [wire](/wire/) - Nearby on the capability axis [GLM 4.6](/models/z-ai__glm-4.6/) - Same vendor [Step 3.7 Flash](/models/stepfun__step-3.7-flash/) - Where this model appears [effort](/effort/) - Nearby on the capability axis [Inkling](/models/thinkingmachines__inkling/) - Where this model appears [traps](/traps/) - Where this model appears [significance](/significance/) ## Badge The verdict as one SVG, for a README or a docs page. It states this model's dominance status at the balanced workload on the LMArena lens, with the date it was computed, and it is rebuilt with the catalogue — so it changes when the verdict changes, including to one you would rather it did not. Markdown Copy [![Step 5 Preview — Undominated.ai dominance verdict](https://undominated.ai/badge/stepfun__step-5-preview.svg)](https://undominated.ai/models/stepfun__step-5-preview/) HTML Copy Step 5 Preview — Undominated.ai dominance verdict Direct file: [https://undominated.ai/badge/stepfun__step-5-preview.svg](https://undominated.ai/badge/stepfun__step-5-preview.svg) — a static SVG, written by scripts/build-badges.mjs on every build, so the copy you embed is never older than the last deploy. ## Continue your investigation - [Explore model families](/families/) - [Compare a shortlist](/compare/) - [Check a model](/check/) - [Understand the evidence](/methodology/)