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GPT-5.4 vs Grok 4-20

Complete pricing and performance comparison between OpenAI's GPT-5.4 and xAI's Grok 4-20.

Quick Verdict

Cheaper
Grok 4-20
1.3x cheaper input, 2.5x cheaper output
Larger Context
GPT-5.4
1.1M vs 131K
Higher Quality
GPT-5.4
Score: 57 vs 49
Faster
Grok 4-20
101 vs 83 tok/s

Pricing Comparison

SpecGPT-5.4Grok 4-20Difference
ProviderOpenAIxAI
Input / 1M tokens$2.5$2Grok 4-20 is 20% more expensive
Output / 1M tokens$15$6Grok 4-20 is 60% more expensive
Context Window1.1M131K8x difference
Max Output128K16K
Tokenizero200k_basecl100k_base

Performance Benchmarks

MetricGPT-5.4Grok 4-20Winner
Quality Index5749GPT-5.4
Output Speed83 tok/s101 tok/sGrok 4-20
Time to First Token131.33s20.69sGrok 4-20
Value (Quality/$)22.924.3Higher = better value

Benchmark data from Artificial Analysis. Quality Index is a composite score across reasoning, coding, and knowledge tasks.

Cost at Scale

Estimated cost at different usage levels (3:1 input-to-output token ratio, typical for chat).

UsageGPT-5.4Grok 4-20Savings
Single request
1K in / 300 out
$0.0070$0.0038Grok 4-20 saves $0.0032
10 requests
10K in / 3K out
$0.070$0.038Grok 4-20 saves $0.032
100 requests
100K in / 30K out
$0.700$0.380Grok 4-20 saves $0.320
1,000 requests
1M in / 300K out
$7.00$3.80Grok 4-20 saves $3.20
10,000 requests
10M in / 3M out
$70.00$38.00Grok 4-20 saves $32.00
1M requests/mo
1B in / 300M out
$7000.00$3800.00Grok 4-20 saves $3200.00

Pros & Cons

GPT-5.4 Strengths

  • +Larger context window (1.1M vs 131K)
  • +Higher max output tokens
  • +Higher quality score (57 vs 49)

Grok 4-20 Strengths

  • +Cheaper input tokens
  • +Cheaper output tokens
  • +Faster output (101 vs 83 tok/s)
  • +Lower latency (faster first token)

When to Use Each Model

Choose GPT-5.4 for

  • Long documents, large codebases, or multi-turn conversations
  • Generating long-form content or detailed code
  • Tasks requiring maximum accuracy and reasoning

Choose Grok 4-20 for

  • Budget-conscious projects where cost is the primary factor
  • Real-time applications, chat, or autocomplete

Frequently Asked Questions

Which is cheaper, GPT-5.4 or Grok 4-20?
For input tokens, Grok 4-20 is 1.3x cheaper at $2/1M tokens. For output tokens, Grok 4-20 is 2.5x cheaper at $6/1M tokens. At typical usage (1M input + 300K output), GPT-5.4 costs $7.00 vs Grok 4-20 at $3.80.
What's the context window difference?
GPT-5.4 supports 1.1M context (1,050,000 tokens), while Grok 4-20 supports 131K (131,072 tokens). GPT-5.4 can handle 8x more context in a single request.
Which model has better benchmarks?
Quality Index: GPT-5.4 scores 57 vs Grok 4-20 at 49. Speed: GPT-5.4 generates 83 tok/s vs Grok 4-20 at 101 tok/s. Time to first token: GPT-5.4 at 131.33s vs Grok 4-20 at 20.69s.
When should I choose GPT-5.4 over Grok 4-20?
Choose GPT-5.4 when you need: Larger context window (1.1M vs 131K), Higher max output tokens, Higher quality score (57 vs 49). Choose Grok 4-20 when you need: Cheaper input tokens, Cheaper output tokens, Faster output (101 vs 83 tok/s), Lower latency (faster first token).
How much would 10,000 API requests cost?
At 1K input + 300 output tokens per request (typical chat): GPT-5.4 = $70.00, Grok 4-20 = $38.00. At 10K input + 1K output per request (longer conversations): GPT-5.4 = $400.00, Grok 4-20 = $260.00.

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