API cost decision in 10 seconds

Reka Edge vs GPT-5.1-Codex

Pick Reka Edge for lower cost; pick GPT-5.1-Codex only if the larger context window matters more.

Pricing data updated: 2026-05-26T11:08:00Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Reka Edge for lower cost; pick GPT-5.1-Codex only if the larger context window matters more.

On the standard 1M input plus 500K output workload, Reka Edge is estimated at $0.15 vs $6.25 for GPT-5.1-Codex, saving $6.1 (97.6% lower).

Cost-first pickReka Edge

Context-first pickGPT-5.1-Codex

Sample savings$6.197.6%

10x traffic gap$61

GPT-5.1-Codex has more context, but Reka Edge saves $6.1 on the standard workload. At 10x that traffic, the same price gap is about $61. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Reka Edge stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shape	Token mix	Better pick	Reka Edge	GPT-5.1-Codex
Input-heavy / RAG	5M input + 500K output	Reka Edge	$0.55	$11.25
Balanced workload	1M input + 1M output	Reka Edge	$0.2	$11.25
Output-heavy chatbot	1M input + 5M output	Reka Edge	$0.6	$51.25

Cheaper input Reka Edge $0.1 vs $1.25 / 1M

Reka Edge is $1.15 cheaper per 1M input tokens (92% lower; 12.5x difference).

Cheaper output Reka Edge $0.1 vs $10 / 1M

Reka Edge is $9.9 cheaper per 1M output tokens (99% lower; 100x difference).

Larger context GPT-5.1-Codex 16.38K vs 400K

GPT-5.1-Codex has 383.62K more context (24.4x larger).

Sample workload Reka Edge $0.15 vs $6.25

Reka Edge is $6.1 cheaper on the standard workload (97.6% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

Reka Edge Calculating… Estimated API cost

GPT-5.1-Codex 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

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

For a 1M input token plus 500K output token workload, the estimated API cost is $0.15 for Reka Edge and $6.25 for GPT-5.1-Codex.

Best Fit

Choose Reka Edge when you care most about lower input-token price, and lower output-token price.

Choose GPT-5.1-Codex when you care most about larger context window.

Decision Notes

On the standard 1M input plus 500K output workload, Reka Edge is estimated at $0.15 vs $6.25 for GPT-5.1-Codex, saving $6.1 (97.6% lower).
Reka Edge is $6.1 cheaper on the standard workload (97.6% lower).
Reka Edge is $1.15 cheaper per 1M input tokens (92% lower; 12.5x difference).
Reka Edge is $9.9 cheaper per 1M output tokens (99% lower; 100x difference).
GPT-5.1-Codex has 383.62K more context (24.4x larger).

Head-to-Head Specs

Feature	Reka Edge (rekaai)	GPT-5.1-Codex (OpenAI)
Input Price prompt tokens per 1M	$0.1	$1.25
Completion Price per 1M tokens	$0.1	$10
Sample Workload Cost 1M input + 500K output	$0.15	$6.25
Context Window	16.38K	400K
Release Date	2026-03-20	2025-11-13

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	Reka Edge	On the standard 1M input plus 500K output workload, Reka Edge is estimated at $0.15 vs $6.25 for GPT-5.1-Codex, saving $6.1 (97.6% lower).
High-volume input processing	Reka Edge	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	Reka Edge	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	GPT-5.1-Codex	A larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps

gpt-oss-120b (free) can replace GPT-5.1-Codex when lower sample workload cost matters most: $0.
gpt-oss-20b (free) can replace GPT-5.1-Codex when lower sample workload cost matters most: $0.
gpt-oss-20b can replace GPT-5.1-Codex when lower sample workload cost matters most: $0.1.
gpt-oss-120b can replace GPT-5.1-Codex when lower sample workload cost matters most: $0.13.

Larger context near this budget

Llama 4 Scout offers 10M context with $0.23 sample workload cost.
Grok 4.20 Multi-Agent offers 2M context with $5 sample workload cost.
Grok 4.20 offers 2M context with $2.5 sample workload cost.
Owl Alpha offers 1.05M context with $0 sample workload cost.

Popular competitors

No popular competitor is currently available.

Cheaper alternatives

Review low-cost models sorted by a standard 1M input plus 500K output workload.

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Larger context alternatives

Find models with larger context windows for RAG, long documents, and codebase review.

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Provider catalogs

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rekaai catalog

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OpenAI catalog

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Reka Edge

Reka Edge is an extremely efficient 7B multimodal vision-language model that accepts image/video+text inputs and generates text outputs. This model is optimized specifically to deliver industry-leading performance in image understanding,...

GPT-5.1-Codex

GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....