Compare/GPT-5.6 Sol (medium) vs Claude Opus 4.5 (Reasoning)

GPT-5.6 Sol (medium)vsClaude Opus 4.5 (Reasoning)

Side-by-side comparison of pricing, 12 benchmarks, and generation speed.

OpenAI

GPT-5.6 Sol (medium)

Input
$4/M
Output
$20/M
Speed
68 tok/s
TTFT
4.15s
Anthropic

Claude Opus 4.5 (Reasoning)

Input
$5/M
Output
$25/M
Speed
50 tok/s
TTFT
12.51s

Winner by Category

Cheaper
GPT-5.6 Sol (medium)
Faster (tok/s)
GPT-5.6 Sol (medium)
Lower Latency
GPT-5.6 Sol (medium)
Benchmarks (2-0)
GPT-5.6 Sol (medium)

Pricing Comparison

MetricGPT-5.6 Sol (medium)Claude Opus 4.5 (Reasoning)
Input ($/M tokens)$4$5
Output ($/M tokens)$20$25
Cost for 1M input + 100K output tokens:
GPT-5.6 Sol (medium)$6.00
Claude Opus 4.5 (Reasoning)$7.50

Speed Comparison

Output Speed (tokens/s) — higher is better
GPT-5.6 Sol (medium)
68 tok/s
Claude Opus 4.5 (Reasoning)
50 tok/s
Time to First Token (seconds) — lower is better
GPT-5.6 Sol (medium)
4.15s
Claude Opus 4.5 (Reasoning)
12.51s

Editorial Analysis

Verdict. GPT-5.6 Sol (medium) wins the overall benchmark matchup 2–0 across 2 overlapping categories, but raw benchmark score is only one input to the decision.

Pricing. Both models sit in the premium bracket for output-token pricing. At 0.8× the per-million-token cost, GPT-5.6 Sol (medium) is meaningfully cheaper if your traffic is output-heavy (long completions, document generation, agent loops). GPT-5.6 Sol (medium) makes more sense when output volume is low and absolute reasoning quality justifies the premium.

Strengths. GPT-5.6 Sol (medium) is strongest on Coding Index (76.3), Intelligence Index (55.6). Claude Opus 4.5 (Reasoning) leads on Intelligence Index (41.9).

Speed. On throughput, GPT-5.6 Sol (medium) generates tokens at 68 tok/s versus 50 tok/s — about 26% faster. On time-to-first-token, GPT-5.6 Sol (medium) responds in 4150ms vs 12510ms, which matters most for chat-style UIs.

Provider. OpenAI and Anthropic sell to overlapping but distinct developer audiences: OpenAI tends to ship frontier reasoning models with premium positioning, while Anthropic often prices more aggressively. Your existing vendor relationships, billing, and SLA preferences may matter as much as the raw numbers above.

Workload cost. Workload scenarios (per million requests at 30M input + 15M output tokens): GPT-5.6 Sol (medium) costs $420.00 ($5040/year); Claude Opus 4.5 (Reasoning) costs $525.00 ($6300/year). At a smaller 5M-input/2M-output scale (single-developer tool or prototype): GPT-5.6 Sol (medium) ≈ $60.00/run, Claude Opus 4.5 (Reasoning) ≈ $75.00/run. At agent/realtime scale (200M input / 100M output per million requests): GPT-5.6 Sol (medium) ≈ $2800/run, Claude Opus 4.5 (Reasoning) ≈ $3500/run. GPT-5.6 Sol (medium) becomes more attractive at higher volume — the absolute per-token pricing difference compounds when you ship at scale.

Recommendation. Both models have legitimate use cases — the right answer depends on whether you are optimizing for benchmark ceiling, latency, or unit cost. Start with the cheaper / faster model, evaluate against your specific task, and only switch if the upgrade shows a meaningful lift.

Benchmark Comparison

Data from Artificial Analysis API — 12 benchmarks

Intelligence Index
55.641.9
Coding Index
76.3
Math Index
GPQA Diamond
MMLU-Pro
LiveCodeBench
AIME 2025
MATH-500
Humanity's Last Exam
SciCode
IFBench
TerminalBench
GPT-5.6 Sol (medium)2 wins
0 winsClaude Opus 4.5 (Reasoning)

Frequently Asked Questions

Which is cheaper, GPT-5.6 Sol (medium) or Claude Opus 4.5 (Reasoning)?

GPT-5.6 Sol (medium) is cheaper overall. Its blended price (3:1 input/output ratio) is $8.00/M tokens vs $10.00/M for Claude Opus 4.5 (Reasoning).

Which model performs better on benchmarks?

GPT-5.6 Sol (medium) wins 2 out of 12 benchmarks compared to 0 for Claude Opus 4.5 (Reasoning). See the detailed benchmark chart above for per-category results.

Which is faster for real-time applications?

GPT-5.6 Sol (medium) generates tokens faster at 68 tok/s vs 50 tok/s. GPT-5.6 Sol (medium) also has lower time-to-first-token (4.15s vs 12.51s).

When should I use GPT-5.6 Sol (medium) vs Claude Opus 4.5 (Reasoning)?

Choose based on your priorities: GPT-5.6 Sol (medium) for lower cost, GPT-5.6 Sol (medium) for stronger benchmark performance, and GPT-5.6 Sol (medium) for faster generation. For latency-sensitive apps, check the TTFT comparison above.