API cost decision in 10 seconds

Devstral 2 2512 vs GPT-5.1-Codex-Mini

Pick GPT-5.1-Codex-Mini when budget and context both matter.

Page updated: 2026-05-26T10:03:26Z Data confirmed: 2026-05-26T12:38:15Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick GPT-5.1-Codex-Mini when budget and context both matter.

On the standard 1M input plus 500K output workload, GPT-5.1-Codex-Mini is estimated at $1.25 vs $1.4 for Devstral 2 2512, saving $0.15 (10.7% lower).

Cost-first pickGPT-5.1-Codex-Mini

Context-first pickGPT-5.1-Codex-Mini

Sample savings$0.1510.7%

10x traffic gap$1.5

GPT-5.1-Codex-Mini is cheaper on the standard workload and also has the larger context window. At 10x that traffic, the same price gap is about $1.5. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

GPT-5.1-Codex-Mini stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shape	Token mix	Better pick	Devstral 2 2512	GPT-5.1-Codex-Mini
Input-heavy / RAG	5M input + 500K output	GPT-5.1-Codex-Mini	$3	$2.25
Balanced workload	1M input + 1M output	GPT-5.1-Codex-Mini	$2.4	$2.25
Output-heavy chatbot	1M input + 5M output	GPT-5.1-Codex-Mini	$10.4	$10.25

Cheaper input GPT-5.1-Codex-Mini $0.4 vs $0.25 / 1M

GPT-5.1-Codex-Mini is $0.15 cheaper per 1M input tokens (37.5% lower; 1.6x difference).

Cheaper output Tie $2 vs $2 / 1M

Both models report the same output price at $2 per 1M tokens.

Larger context GPT-5.1-Codex-Mini 262.14K vs 400K

GPT-5.1-Codex-Mini has 137.86K more context (1.53x larger).

Sample workload GPT-5.1-Codex-Mini $1.4 vs $1.25

GPT-5.1-Codex-Mini is $0.15 cheaper on the standard workload (10.7% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

Devstral 2 2512 Calculating… Estimated API cost

GPT-5.1-Codex-Mini 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

GPT-5.1-Codex-Mini has the lower input price; both models tie on output price; GPT-5.1-Codex-Mini offers the larger context window. For the 1M input plus 500K output sample, GPT-5.1-Codex-Mini is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $1.4 for Devstral 2 2512 and $1.25 for GPT-5.1-Codex-Mini.

Best Fit

Choose Devstral 2 2512 when its provider, model quality, latency, or availability is more important than the numeric price/context winner.

Choose GPT-5.1-Codex-Mini when you care most about lower input-token price, and larger context window.

Decision Notes

On the standard 1M input plus 500K output workload, GPT-5.1-Codex-Mini is estimated at $1.25 vs $1.4 for Devstral 2 2512, saving $0.15 (10.7% lower).
GPT-5.1-Codex-Mini is $0.15 cheaper on the standard workload (10.7% lower).
GPT-5.1-Codex-Mini is $0.15 cheaper per 1M input tokens (37.5% lower; 1.6x difference).
Both models report the same output price at $2 per 1M tokens.
GPT-5.1-Codex-Mini has 137.86K more context (1.53x larger).

Head-to-Head Specs

Feature	Devstral 2 2512 (Mistral)	GPT-5.1-Codex-Mini (OpenAI)
Input Price prompt tokens per 1M	$0.4	$0.25
Completion Price per 1M tokens	$2	$2
Sample Workload Cost 1M input + 500K output	$1.4	$1.25
Context Window	262.14K	400K
Release Date	2025-12-09	2025-11-13

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	GPT-5.1-Codex-Mini	On the standard 1M input plus 500K output workload, GPT-5.1-Codex-Mini is estimated at $1.25 vs $1.4 for Devstral 2 2512, saving $0.15 (10.7% lower).
High-volume input processing	GPT-5.1-Codex-Mini	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	Tie	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	GPT-5.1-Codex-Mini	A 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 Devstral 2 2512 when lower sample workload cost matters most: $0.04.
Mistral Small 3 can replace Devstral 2 2512 when lower sample workload cost matters most: $0.09.
Ministral 3 3B 2512 can replace Devstral 2 2512 when lower sample workload cost matters most: $0.15.
Mistral Small 3.2 24B can replace Devstral 2 2512 when lower sample workload cost matters most: $0.17.

Larger context near this budget

Llama 4 Scout offers 10M context with $0.23 sample workload cost.
Owl Alpha offers 1.05M context with $0 sample workload cost.
DeepSeek V4 Flash offers 1.05M context with $0.2 sample workload cost.
DeepSeek V4 Pro offers 1.05M context with $0.87 sample workload cost.

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Mistral catalog

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OpenAI catalog

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Devstral 2 2512

Devstral 2 is a state-of-the-art open-source model by Mistral AI specializing in agentic coding. It is a 123B-parameter dense transformer model supporting a 256K context window. Devstral 2 supports exploring...

GPT-5.1-Codex-Mini

GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex