API cost decision in 10 seconds

GPT-5 Chat vs R1

Pick R1 when budget and context both matter.

Page updated: 2026-05-26T15:08:08Z Data confirmed: 2026-05-26T18:08:02Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick R1 when budget and context both matter.

On the standard 1M input plus 500K output workload, R1 is estimated at $1.95 vs $6.25 for GPT-5 Chat, saving $4.3 (68.8% lower).

Cost-first pickR1

Context-first pickR1

Sample savings$4.368.8%

10x traffic gap$43

R1 is cheaper on the standard workload and also has the larger context window. At 10x that traffic, the same price gap is about $43. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

R1 stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shape	Token mix	Better pick	GPT-5 Chat	R1
Input-heavy / RAG	5M input + 500K output	R1	$11.25	$4.75
Balanced workload	1M input + 1M output	R1	$11.25	$3.2
Output-heavy chatbot	1M input + 5M output	R1	$51.25	$13.2

Cheaper input R1 $1.25 vs $0.7 / 1M

R1 is $0.55 cheaper per 1M input tokens (44% lower; 1.79x difference).

Cheaper output R1 $10 vs $2.5 / 1M

R1 is $7.5 cheaper per 1M output tokens (75% lower; 4x difference).

Larger context R1 128K vs 163.84K

R1 has 35.84K more context (1.28x larger).

Sample workload R1 $6.25 vs $1.95

R1 is $4.3 cheaper on the standard workload (68.8% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

GPT-5 Chat Calculating… Estimated API cost

R1 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

R1 has the lower input price; R1 has the lower output price; R1 offers the larger context window. For the 1M input plus 500K output sample, R1 is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $6.25 for GPT-5 Chat and $1.95 for R1.

Best Fit

Choose GPT-5 Chat when its provider, model quality, latency, or availability is more important than the numeric price/context winner.

Choose R1 when you care most about lower input-token price, lower output-token price, and larger context window.

Decision Notes

On the standard 1M input plus 500K output workload, R1 is estimated at $1.95 vs $6.25 for GPT-5 Chat, saving $4.3 (68.8% lower).
R1 is $4.3 cheaper on the standard workload (68.8% lower).
R1 is $0.55 cheaper per 1M input tokens (44% lower; 1.79x difference).
R1 is $7.5 cheaper per 1M output tokens (75% lower; 4x difference).
R1 has 35.84K more context (1.28x larger).

Head-to-Head Specs

Feature	GPT-5 Chat (OpenAI)	R1 (DeepSeek)
Input Price prompt tokens per 1M	$1.25	$0.7
Completion Price per 1M tokens	$10	$2.5
Sample Workload Cost 1M input + 500K output	$6.25	$1.95
Context Window	128K	163.84K
Release Date	2025-08-07	2025-01-20
Popularity	#111	#144

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	R1	On the standard 1M input plus 500K output workload, R1 is estimated at $1.95 vs $6.25 for GPT-5 Chat, saving $4.3 (68.8% lower).
High-volume input processing	R1	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	R1	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	R1	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 Chat when lower sample workload cost matters most: $0.
gpt-oss-20b (free) can replace GPT-5 Chat when lower sample workload cost matters most: $0.
gpt-oss-20b can replace GPT-5 Chat when lower sample workload cost matters most: $0.1.
gpt-oss-120b can replace GPT-5 Chat 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 offers 2M context with $2.5 sample workload cost.
Grok 4.20 Multi-Agent offers 2M context with $5 sample workload cost.
Owl Alpha offers 1.05M context with $0 sample workload cost.

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Cheaper alternatives

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Larger context alternatives

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Provider catalogs

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OpenAI catalog

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DeepSeek catalog

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GPT-5 Chat

GPT-5 Chat is designed for advanced, natural, multimodal, and context-aware conversations for enterprise applications.

DeepSeek R1 is here: Performance on par with [OpenAI o1](/openai/o1), but open-sourced and with fully open reasoning tokens. It's 671B parameters in size, with 37B active in an inference pass....