Data points: 73
Model compare
The readout for Claude Haiku 4.5 and GPT-5.5 Pro, before the detailed comparison sheet.
Weighted outcome: GPT-5.5 Pro. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.5 Pro
GPT-5.5 Pro has the higher weighted result; Model A / B score 20 to 80.
Evidence depth
73 data points
Includes 5 benchmark rows, 0 audit samples, and 6 provider examples.
Selection signal
Start with GPT-5.5 Pro
The charts below split 11 high-signal samples across speed, scores, and audit health.
Switch either side of this report to compare another model with the same LMSpeed data pipeline.
Select a different model to open a new comparison URL.
This report only uses LMSpeed data for Claude Haiku 4.5 and GPT-5.5 Pro: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | Claude Haiku 4.5 | GPT-5.5 Pro |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 20.0 pts | 80.0 pts |
| Benchmark category leads | 0 categories | 3 categories |
| Operational advantages | Cheapest input price, Free providers, Provider coverage | No data |
| Context window | 200K tokens | 1.1M tokens |
| Max output | 64K tokens | 128K tokens |
| Modalities | Input TextImageFile Output Text |
The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.
| Model compare | Claude Haiku 4.5 | GPT-5.5 Pro |
|---|---|---|
| Developer | Anthropic | OpenAI |
| Released | Oct 2025 | Apr 2026 |
| Parameters | No data | No data |
| Tokenizer | Claude | GPT |
| Knowledge cutoff | No data | 2025-12-01 |
| OpenRouter ID | anthropic/claude-haiku-4.5 | openai/gpt-5.5-pro |
| References | No data | No data |
This report only uses LMSpeed data for Claude Haiku 4.5 and GPT-5.5 Pro: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
Claude Haiku 4.5
Claude Haiku 4.5 has these operational advantages: Cheapest input price, Free providers, Provider coverage.
GPT-5.5 Pro
GPT-5.5 Pro leads these benchmark categories: Agents, Reasoning, Math.
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.
Avg. score
Claude Haiku 4.5
45.8
Avg. score
GPT-5.5 Pro
60.7
GPT-5.5 Pro leads by 18.5
Claude Haiku 4.5
GPT-5.5 Pro leads by 15.5
GPT-5.5 Pro
GPT-5.5 Pro leads by 11.5
No data
No data
No data
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
Claude Haiku 4.5
53.0
Rank #56/93 · confidence 1 · eval date 2025-10-15
GPT-5.5 Pro
winner76.0
Rank #10/93 · confidence 1 · eval date 2026-04-23
Claude Haiku 4.5
4.2%
Rank #160/199 · confidence 4
GPT-5.5 Pro
winner57.2%
Rank #2/199 · confidence 1 · eval date 2026-04-23
Claude Haiku 4.5
2.1
Rank #32/35 · confidence 1 · eval date 2025-10-15
GPT-5.5 Pro
winner39.6
Rank #4/35 · confidence 1 · eval date 2026-04-23
Claude Haiku 4.5
5.9
Rank #36/47 · confidence 1 · eval date 2025-10-15
GPT-5.5 Pro
winner51.0
Rank #5/47 · confidence 1 · eval date 2026-04-23
Claude Haiku 4.5
29.2
Rank #46/59 · confidence 1 · eval date 2025-10-15
GPT-5.5 Pro
winner72.1
Rank #15/59 · confidence 1 · eval date 2026-04-23
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Claude Haiku 4.5 | GPT-5.5 Pro |
|---|---|---|
| No completed audits are available from shared providers yet. | ||
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | Claude Haiku 4.5 | GPT-5.5 Pro |
|---|---|---|
15 tests | Claude Haiku 4.5 speed / latency 112 tok/s / 1733ms input / output No data | GPT-5.5 Pro speed / latency N/A / N/A input / output No data |
5 tests | Claude Haiku 4.5 speed / latency 141 tok/s / 1922ms input / output No data | GPT-5.5 Pro speed / latency N/A / N/A input / output No data |
0 tests | Claude Haiku 4.5 speed / latency N/A / N/A input / output No data | GPT-5.5 Pro speed / latency N/A / N/A input / output No data |
0 tests | Claude Haiku 4.5 speed / latency N/A / N/A input / output No data | GPT-5.5 Pro speed / latency N/A / N/A input / output No data |
0 tests | Claude Haiku 4.5 speed / latency N/A / N/A input / output No data | GPT-5.5 Pro speed / latency N/A / N/A input / output No data |
Claude Haiku 4.5 claude-haiku-4-5-20251001 speed / latency No data input / output $0/request | GPT-5.5 Pro gpt-5.5-pro speed / latency No data input / output $0/request |
Weighted outcome: GPT-5.5 Pro. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Input
Output
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
