API cost decision in 10 seconds

NewGPT Chat Latest vs Claude Opus 4.6 (Fast)

Pick GPT Chat Latest for lower cost; pick Claude Opus 4.6 (Fast) only if the larger context window matters more.

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

Budget verdict

Pick GPT Chat Latest for lower cost; pick Claude Opus 4.6 (Fast) only if the larger context window matters more.

On the standard 1M input plus 500K output workload, GPT Chat Latest is estimated at $20 vs $105 for Claude Opus 4.6 (Fast), saving $85 (81% lower).

Cost-first pickGPT Chat Latest
Context-first pickClaude Opus 4.6 (Fast)
Sample savings$8581%
10x traffic gap$850

Claude Opus 4.6 (Fast) has more context, but GPT Chat Latest saves $85 on the standard workload. 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 Chat Latest stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shapeToken mixBetter pickGPT Chat LatestClaude Opus 4.6 (Fast)
Input-heavy / RAG5M input + 500K outputGPT Chat Latest$40$225
Balanced workload1M input + 1M outputGPT Chat Latest$35$180
Output-heavy chatbot1M input + 5M outputGPT Chat Latest$155$780
Cheaper input GPT Chat Latest $5 vs $30 / 1M

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

Cheaper output GPT Chat Latest $30 vs $150 / 1M

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

Larger context Claude Opus 4.6 (Fast) 400K vs 1M

Claude Opus 4.6 (Fast) has 600K more context (2.5x larger).

Sample workload GPT Chat Latest $20 vs $105

GPT Chat Latest 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 Chat Latest Calculating… Estimated API cost
Claude Opus 4.6 (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 Chat Latest has the lower input price; GPT Chat Latest has the lower output price; Claude Opus 4.6 (Fast) offers the larger context window. For the 1M input plus 500K output sample, GPT Chat Latest is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $20 for GPT Chat Latest and $105 for Claude Opus 4.6 (Fast).

Best Fit

Choose GPT Chat Latest when you care most about lower input-token price, and lower output-token price.

Choose Claude Opus 4.6 (Fast) when you care most about larger context window.

Decision Notes
  • On the standard 1M input plus 500K output workload, GPT Chat Latest is estimated at $20 vs $105 for Claude Opus 4.6 (Fast), saving $85 (81% lower).
  • GPT Chat Latest is $85 cheaper on the standard workload (81% lower).
  • GPT Chat Latest is $25 cheaper per 1M input tokens (83.3% lower; 6x difference).
  • GPT Chat Latest is $120 cheaper per 1M output tokens (80% lower; 5x difference).
  • Claude Opus 4.6 (Fast) has 600K more context (2.5x larger).
Head-to-Head Specs
FeatureNewGPT Chat Latest
(OpenAI)		Claude Opus 4.6 (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 Window400K1M
Release Date

Use-Case Decision Matrix

Use caseBetter pickWhy
Budget-constrained productionGPT Chat LatestOn the standard 1M input plus 500K output workload, GPT Chat Latest is estimated at $20 vs $105 for Claude Opus 4.6 (Fast), saving $85 (81% lower).
High-volume input processingGPT Chat LatestLower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbotsGPT Chat LatestLower output-token price matters most when assistants generate many completion tokens.
RAG or long-document workClaude Opus 4.6 (Fast)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 Chat Latest when lower sample workload cost matters most: $0.
  • gpt-oss-20b (free) can replace GPT Chat Latest when lower sample workload cost matters most: $0.
  • gpt-oss-20b can replace GPT Chat Latest when lower sample workload cost matters most: $0.1.
  • gpt-oss-120b can replace GPT Chat Latest 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-5.5 offers 1.05M context with $20 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.

Open largest context models

Provider catalogs

Compare models within provider hubs before choosing a final API vendor.

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OpenAI catalog

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

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Anthropic catalog

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

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GPT Chat Latest

GPT Chat Latest points to OpenAI's stable API alias `chat-latest` that always resolves to the latest Instant chat model used in ChatGPT. As OpenAI rolls out new Instant model updates...

Claude Opus 4.6 (Fast)

Fast-mode variant of [Opus 4.6](/anthropic/claude-opus-4.6) - 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