API cost decision in 10 seconds

Step 3.5 Flash vs Mistral Large 3 2512

Pick Step 3.5 Flash when budget is the priority.

Pricing data updated:  Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Step 3.5 Flash when budget is the priority.

On the standard 1M input plus 500K output workload, Step 3.5 Flash is estimated at $0.24 vs $1.25 for Mistral Large 3 2512, saving $1.01 (80.8% lower).

Cost-first pickStep 3.5 Flash
Context-first pickBoth models
Sample savings$1.0180.8%
10x traffic gap$10.1

The reported context window is tied, so cost and provider fit carry more weight. At 10x that traffic, the same price gap is about $10.1. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Step 3.5 Flash stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shapeToken mixBetter pickStep 3.5 FlashMistral Large 3 2512
Input-heavy / RAG5M input + 500K outputStep 3.5 Flash$0.6$3.25
Balanced workload1M input + 1M outputStep 3.5 Flash$0.39$2
Output-heavy chatbot1M input + 5M outputStep 3.5 Flash$1.59$8
Cheaper input Step 3.5 Flash $0.09 vs $0.5 / 1M

Step 3.5 Flash is $0.41 cheaper per 1M input tokens (82% lower; 5.56x difference).

Cheaper output Step 3.5 Flash $0.3 vs $1.5 / 1M

Step 3.5 Flash is $1.2 cheaper per 1M output tokens (80% lower; 5x difference).

Larger context Tie 262.14K vs 262.14K

Both models report the same context window at 262.14K tokens.

Sample workload Step 3.5 Flash $0.24 vs $1.25

Step 3.5 Flash is $1.01 cheaper on the standard workload (80.8% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.
Step 3.5 Flash Calculating… Estimated API cost
Mistral Large 3 2512 Calculating… Estimated API cost
Cheaper for this workload Calculating… Difference: calculating…

This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.

Quick Decision

Verdict

Step 3.5 Flash has the lower input price; Step 3.5 Flash has the lower output price; both models report the same context window. For the 1M input plus 500K output sample, Step 3.5 Flash is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $0.24 for Step 3.5 Flash and $1.25 for Mistral Large 3 2512.

Best Fit

Choose Step 3.5 Flash when you care most about lower input-token price, and lower output-token price.

Choose Mistral Large 3 2512 when its provider, model quality, latency, or availability is more important than the numeric price/context winner.

Decision Notes
  • On the standard 1M input plus 500K output workload, Step 3.5 Flash is estimated at $0.24 vs $1.25 for Mistral Large 3 2512, saving $1.01 (80.8% lower).
  • Step 3.5 Flash is $1.01 cheaper on the standard workload (80.8% lower).
  • Step 3.5 Flash is $0.41 cheaper per 1M input tokens (82% lower; 5.56x difference).
  • Step 3.5 Flash is $1.2 cheaper per 1M output tokens (80% lower; 5x difference).
  • Both models report the same context window at 262.14K tokens.
Head-to-Head Specs
FeatureStep 3.5 Flash
(StepFun)		Mistral Large 3 2512
(Mistral)
Input Price
prompt tokens per 1M		$0.09$0.5
Completion Price
per 1M tokens		$0.3$1.5
Sample Workload Cost
1M input + 500K output		$0.24$1.25
Context Window262.14K262.14K
Release Date

Use-Case Decision Matrix

Use caseBetter pickWhy
Budget-constrained productionStep 3.5 FlashOn the standard 1M input plus 500K output workload, Step 3.5 Flash is estimated at $0.24 vs $1.25 for Mistral Large 3 2512, saving $1.01 (80.8% lower).
High-volume input processingStep 3.5 FlashLower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbotsStep 3.5 FlashLower output-token price matters most when assistants generate many completion tokens.
RAG or long-document workTieA larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps
  • Mistral Nemo can replace Mistral Large 3 2512 when lower sample workload cost matters most: $0.04.
  • Mistral Small 3 can replace Mistral Large 3 2512 when lower sample workload cost matters most: $0.09.
  • Ministral 3 3B 2512 can replace Mistral Large 3 2512 when lower sample workload cost matters most: $0.15.
  • Mistral Small 3.2 24B can replace Mistral Large 3 2512 when lower sample workload cost matters most: $0.17.
Larger context near this budget
Popular competitors
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Cheaper alternatives

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Larger context alternatives

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Provider catalogs

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StepFun catalog

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Mistral catalog

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Open Mistral models
Step 3.5 Flash

Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token....

Mistral Large 3 2512

Mistral Large 3 2512 is Mistral’s most capable model to date, featuring a sparse mixture-of-experts architecture with 41B active parameters (675B total), and released under the Apache 2.0 license.