Model Comparison
GPT-4 Turbo
vs. GPT-5.5 Instant (May 2026)
Comparing 2 AI models · 11 benchmarks · OpenAI
Recommended Pick
Op GPT-5.5 Instant (May 2026) 10 metric wins Strongest on: Value, Input price, Blended price
Best Value
GPT-5.5 Instant (May 2026)
100.0 value score
46.1 reasoning / $11.25/1M
Lowest Price
GPT-5.5 Instant (May 2026)
$5.00/1M input price
Best Reasoning
GPT-5.5 Instant (May 2026)
46.1 reasoning score
Blends available reasoning benchmarks
Best for Coding
GPT-5.5 Instant (May 2026)
45.1 coding index
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Best value
GPT-5.5 Instant (May 2026) has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
GPT-5.5 Instant (May 2026) is 2.0x cheaper on input tokens than GPT-4 Turbo.
Reasoning gap
GPT-5.5 Instant (May 2026) leads GPT-4 Turbo by 21.2 points on reasoning.
Coding gap
GPT-5.5 Instant (May 2026) leads GPT-4 Turbo by 23.6 points on coding.
Top-pick rationale
GPT-5.5 Instant (May 2026) wins 10 measurable categories, including Value, Input price, Blended price, TTFT.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
GPT-4 Turbo
OpenAI
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
GPT-5.5 Instant (May 2026)
OpenAI
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
Full Comparison
| Metric | Op GPT-4 Turbo | Top Pick Op GPT-5.5 Instant (May 2026) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $10.00/1M | $5.00/1M |
| Output Cost | $30.00/1M | $30.00/1M |
| Blended (3:1) | $15.00/1M | $11.25/1M |
| Specifications | ||
| Organization | OpenAI | OpenAI |
| Release Date | Nov 6, 2023 | May 5, 2026 |
| Performance & Speed | ||
| Throughput | 31.0 tok/s | — |
| TTFT | 1346ms | — |
| Latency | 1346ms | — |
| Composite Indices | ||
| Value Score | 40.6 | 100.0 |
| Reasoning Score | 25.0 | 46.1 |
| Intelligence | 7.9 | 33.5 |
| Coding | 21.5 | 45.1 |
| Standard Benchmarks | ||
| GPQA | — | 84.6% |
| MMLU Pro | 69.4% | — |
| HLE | 3.3% | 20.3% |
| LiveCodeBench | 29.1% | — |
| MATH 500 | 73.7% | — |
| AIME (Original) | 15.0% | — |
| SciCode | 31.9% | 50.3% |
| LCR | — | 55.7% |
| IFBench | — | 71.5% |
| TAU-bench v2 | — | 49.4% |
| TerminalBench Hard | — | 42.4% |
Key Takeaways
GPT-5.5 Instant (May 2026) offers the best value at $5.00/1M, making it ideal for high-volume applications and cost-conscious projects.
GPT-5.5 Instant (May 2026) has the strongest reasoning profile with a 46.1 reasoning score, combining the available reasoning-heavy benchmarks.
GPT-5.5 Instant (May 2026) reaches a 45.1 coding index, making it the top choice for software development and code generation tasks.
All models support context windows of ∞+ tokens, suitable for processing lengthy documents and maintaining extended conversations.
When to Choose Each Model
GPT-4 Turbo
- General-purpose AI
- Versatile applications
GPT-5.5 Instant (May 2026)
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
