API cost decision in 10 seconds

🔥GPT-5.5 vs NewClaude Opus 4.7 (Fast)

Pick GPT-5.5 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-5.5 when budget and context both matter.

On the standard 1M input plus 500K output workload, GPT-5.5 is estimated at $20 vs $105 for Claude Opus 4.7 (Fast), saving $85 (81% lower).

Cost-first pickGPT-5.5
Context-first pickGPT-5.5
Sample savings$8581%
10x traffic gap$850

GPT-5.5 is cheaper on the standard workload and also has the larger context window. At 10x that traffic, the same price gap is about $850. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

GPT-5.5 stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shapeToken mixBetter pickGPT-5.5Claude Opus 4.7 (Fast)
Input-heavy / RAG5M input + 500K outputGPT-5.5$40$225
Balanced workload1M input + 1M outputGPT-5.5$35$180
Output-heavy chatbot1M input + 5M outputGPT-5.5$155$780
Cheaper input GPT-5.5 $5 vs $30 / 1M

GPT-5.5 is $25 cheaper per 1M input tokens (83.3% lower; 6x difference).

Cheaper output GPT-5.5 $30 vs $150 / 1M

GPT-5.5 is $120 cheaper per 1M output tokens (80% lower; 5x difference).

Larger context GPT-5.5 1.05M vs 1M

GPT-5.5 has 50K more context (1.05x larger).

Sample workload GPT-5.5 $20 vs $105

GPT-5.5 is $85 cheaper on the standard workload (81% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.
GPT-5.5 Calculating… Estimated API cost
Claude Opus 4.7 (Fast) 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-5.5 has the lower input price; GPT-5.5 has the lower output price; GPT-5.5 offers the larger context window. For the 1M input plus 500K output sample, GPT-5.5 is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $20 for GPT-5.5 and $105 for Claude Opus 4.7 (Fast).

Best Fit

Choose GPT-5.5 when you care most about lower input-token price, lower output-token price, and larger context window.

Choose Claude Opus 4.7 (Fast) 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-5.5 is estimated at $20 vs $105 for Claude Opus 4.7 (Fast), saving $85 (81% lower).
  • GPT-5.5 is $85 cheaper on the standard workload (81% lower).
  • GPT-5.5 is $25 cheaper per 1M input tokens (83.3% lower; 6x difference).
  • GPT-5.5 is $120 cheaper per 1M output tokens (80% lower; 5x difference).
  • GPT-5.5 has 50K more context (1.05x larger).
Head-to-Head Specs
Feature🔥GPT-5.5
(OpenAI)		NewClaude Opus 4.7 (Fast)
(Anthropic)
Input Price
prompt tokens per 1M		$5$30
Completion Price
per 1M tokens		$30$150
Sample Workload Cost
1M input + 500K output		$20$105
Context Window1.05M1M
Release Date
Popularity#17

Use-Case Decision Matrix

Use caseBetter pickWhy
Budget-constrained productionGPT-5.5On the standard 1M input plus 500K output workload, GPT-5.5 is estimated at $20 vs $105 for Claude Opus 4.7 (Fast), saving $85 (81% lower).
High-volume input processingGPT-5.5Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbotsGPT-5.5Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document workGPT-5.5A 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-5.5 when lower sample workload cost matters most: $0.
  • gpt-oss-20b (free) can replace GPT-5.5 when lower sample workload cost matters most: $0.
  • gpt-oss-20b can replace GPT-5.5 when lower sample workload cost matters most: $0.1.
  • gpt-oss-120b can replace GPT-5.5 when lower sample workload cost matters most: $0.13.
Larger context near this budget

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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Anthropic catalog

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

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GPT-5.5

GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...

Claude Opus 4.7 (Fast)

Fast-mode variant of [Opus 4.7](/anthropic/claude-opus-4.7) - identical capabilities with higher output speed at premium 6x pricing. Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode