Claude Sonnet 4.5 (2025-09-29) vs GPT-5 mini
Claude Sonnet 4.5 (2025-09-29) vs GPT-5 mini: GPT-5 mini is cheaper by 92% on average. Claude Sonnet 4.5 (2025-09-29) from Anthropic (200,000-token context, reasoning, tool calls) vs. GPT-5 mini from OpenAI (272,000-token context, reasoning, tool calls). Use Agent Command Center to A/B both in shadow mode and pick the winner per workload.
Side-by-side cost
Live workload comparison
Same workload run through both models. The cheaper one is highlighted.
3,000
0272,000
400
0128,000
5,000
01,000,000
At this workload, GPT-5 mini is 90% cheaper than Claude Sonnet 4.5 (2025-09-29) — a savings of $2,047/month ($24,563/year).
Production recipe — Agent Command Center
strategy: cost-optimized
primary:
model: gpt-5-mini
provider: openai
fallback:
model: claude-sonnet-4-5-20250929
provider: anthropic
shadow: { sample_rate: 0.05 } # mirror 5% of traffic to compare quality live| Claude Sonnet 4.5 (2025-09-29) | GPT-5 mini | |
|---|---|---|
| Input price | $3.00/M | $0.250/M |
| Output price | $15.00/M | $2.00/M |
| Context window | 200,000 | 272,000 |
| Max output | 64,000 | 128,000 |
| Function calling | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio input | — | — |
| Reasoning | ✓ | ✓ |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Pricing verified | May 12, 2026 | May 12, 2026 |
Benchmark comparison
Side-by-side public benchmark scores. Greener bar = winner.
Chatbot Arena ELOgeneral
Claude Sonnet 4.5 (2025-09-29)
1,454
GPT-5 mini
1,395
AIME 2025math
Claude Sonnet 4.5 (2025-09-29)
100.0%
GPT-5 mini
—
HumanEvalcode
Claude Sonnet 4.5 (2025-09-29)
93.7%
GPT-5 mini
93.5%
AIME 2024math
Claude Sonnet 4.5 (2025-09-29)
79.6%
GPT-5 mini
91.1%
MMLU-Proreasoning⚠ different settings
Claude Sonnet 4.5 (2025-09-29)
87.4%
GPT-5 mini
82.0%
GPQA Diamondreasoning⚠ different settings
Claude Sonnet 4.5 (2025-09-29)
84.4%
GPT-5 mini
78.4%
SWE-bench Verifiedagent
Claude Sonnet 4.5 (2025-09-29)
82.0%
GPT-5 mini
68.0%