API cost decision in 10 seconds

GPT-5.3-Codex vs Sonar Pro Search

Pick GPT-5.3-Codex when budget and context both matter.

Page updated:  Data confirmed:  Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick GPT-5.3-Codex when budget and context both matter.

On the standard 1M input plus 500K output workload, GPT-5.3-Codex is estimated at $8.75 vs $10.5 for Sonar Pro Search, saving $1.75 (16.7% lower).

Cost-first pickGPT-5.3-Codex
Context-first pickGPT-5.3-Codex
Sample savings$1.7516.7%
10x traffic gap$17.5

GPT-5.3-Codex is cheaper on the standard workload and also has the larger context window. At 10x that traffic, the same price gap is about $17.5. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

GPT-5.3-Codex stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shapeToken mixBetter pickGPT-5.3-CodexSonar Pro Search
Input-heavy / RAG5M input + 500K outputGPT-5.3-Codex$15.75$22.5
Balanced workload1M input + 1M outputGPT-5.3-Codex$15.75$18
Output-heavy chatbot1M input + 5M outputGPT-5.3-Codex$71.75$78
Cheaper input GPT-5.3-Codex $1.75 vs $3 / 1M

GPT-5.3-Codex is $1.25 cheaper per 1M input tokens (41.7% lower; 1.71x difference).

Cheaper output GPT-5.3-Codex $14 vs $15 / 1M

GPT-5.3-Codex is $1 cheaper per 1M output tokens (6.7% lower; 1.07x difference).

Larger context GPT-5.3-Codex 400K vs 200K

GPT-5.3-Codex has 200K more context (2x larger).

Sample workload GPT-5.3-Codex $8.75 vs $10.5

GPT-5.3-Codex is $1.75 cheaper on the standard workload (16.7% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.
GPT-5.3-Codex Calculating… Estimated API cost
Sonar Pro Search 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-5.3-Codex has the lower input price; GPT-5.3-Codex has the lower output price; GPT-5.3-Codex offers the larger context window. For the 1M input plus 500K output sample, GPT-5.3-Codex is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $8.75 for GPT-5.3-Codex and $10.5 for Sonar Pro Search.

Best Fit

Choose GPT-5.3-Codex when you care most about lower input-token price, lower output-token price, and larger context window.

Choose Sonar Pro Search 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, GPT-5.3-Codex is estimated at $8.75 vs $10.5 for Sonar Pro Search, saving $1.75 (16.7% lower).
  • GPT-5.3-Codex is $1.75 cheaper on the standard workload (16.7% lower).
  • GPT-5.3-Codex is $1.25 cheaper per 1M input tokens (41.7% lower; 1.71x difference).
  • GPT-5.3-Codex is $1 cheaper per 1M output tokens (6.7% lower; 1.07x difference).
  • GPT-5.3-Codex has 200K more context (2x larger).
Head-to-Head Specs
FeatureGPT-5.3-Codex
(OpenAI)		Sonar Pro Search
(Perplexity)
Input Price
prompt tokens per 1M		$1.75$3
Completion Price
per 1M tokens		$14$15
Sample Workload Cost
1M input + 500K output		$8.75$10.5
Context Window400K200K
Release Date

Use-Case Decision Matrix

Use caseBetter pickWhy
Budget-constrained productionGPT-5.3-CodexOn the standard 1M input plus 500K output workload, GPT-5.3-Codex is estimated at $8.75 vs $10.5 for Sonar Pro Search, saving $1.75 (16.7% lower).
High-volume input processingGPT-5.3-CodexLower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbotsGPT-5.3-CodexLower output-token price matters most when assistants generate many completion tokens.
RAG or long-document workGPT-5.3-CodexA 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-5.3-Codex when lower sample workload cost matters most: $0.
  • gpt-oss-20b (free) can replace GPT-5.3-Codex when lower sample workload cost matters most: $0.
  • gpt-oss-20b can replace GPT-5.3-Codex when lower sample workload cost matters most: $0.1.
  • gpt-oss-120b can replace GPT-5.3-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.
  • GPT-5.4 offers 1.05M context with $10 sample workload cost.

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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OpenAI catalog

Review all tracked OpenAI models before deciding whether this matchup is the right shortlist.

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Perplexity catalog

Check other Perplexity models with comparable pricing, context, or release timing.

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Exclusively available on the OpenRouter API, Sonar Pro's new Pro Search mode is Perplexity's most advanced agentic search system. It is designed for deeper reasoning and analysis. Pricing is based...